Class 9 Exam > Class 9 Questions > A body goes from A to B with a velocity of 20...
Start Learning for Free
A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of
30 m/s. The average velocity of the body during the whole journey is
30 m/s. The average velocity of the body during the whole journey is
- a)0
- b)25 m/s
- c)20 m/s
- d)none of these
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A body goes from A to B with a velocity of 20 m/s and comes back B to ...
If we presume that the distance is x m, then in the first case, the time needed is x/20 s.
In the second case the time is x/30
The total distance covered is 2x m
The total time
=(x/20+x/30) s
=5x/60 s
=x/12 s
Now, the average velocity will be
=total distance / total time
=2x/(x/12)m/s
=24 m/s
Most Upvoted Answer
A body goes from A to B with a velocity of 20 m/s and comes back B to ...
Average velocity is defined as the total displacement divided by the total time taken. In this case, the body goes from point A to point B with a velocity of 20 m/s and then returns from point B to point A with a velocity of 30 m/s.
To calculate the average velocity, we need to find the total displacement and the total time taken.
- Finding the total displacement:
When the body goes from A to B, the displacement is the distance between A and B, which we can call d1.
When the body comes back from B to A, the displacement is the distance between B and A, which we can call d2.
Since the body returns to its original position, d2 is equal to d1 but in the opposite direction. Therefore, d2 is equal to -d1.
The total displacement is the sum of d1 and -d1, which is equal to 0.
- Finding the total time taken:
Let's assume the time taken to go from A to B is t1, and the time taken to come back from B to A is t2.
The total time taken is the sum of t1 and t2.
Now, let's calculate the average velocity using the formula:
Average velocity = Total displacement / Total time taken
Since the total displacement is 0, and any number divided by 0 is undefined, we can conclude that the average velocity of the body during the whole journey is 0.
Therefore, the correct answer is option 'A' - 0 m/s.
To calculate the average velocity, we need to find the total displacement and the total time taken.
- Finding the total displacement:
When the body goes from A to B, the displacement is the distance between A and B, which we can call d1.
When the body comes back from B to A, the displacement is the distance between B and A, which we can call d2.
Since the body returns to its original position, d2 is equal to d1 but in the opposite direction. Therefore, d2 is equal to -d1.
The total displacement is the sum of d1 and -d1, which is equal to 0.
- Finding the total time taken:
Let's assume the time taken to go from A to B is t1, and the time taken to come back from B to A is t2.
The total time taken is the sum of t1 and t2.
Now, let's calculate the average velocity using the formula:
Average velocity = Total displacement / Total time taken
Since the total displacement is 0, and any number divided by 0 is undefined, we can conclude that the average velocity of the body during the whole journey is 0.
Therefore, the correct answer is option 'A' - 0 m/s.
Attention Class 9 Students!
To make sure you are not studying endlessly, EduRev has designed Class 9 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 9.
|
Explore Courses for Class 9 exam
|
|
Similar Class 9 Doubts
Top Courses for Class 9View all
A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer?
Question Description
A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer?.
A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer?.
Solutions for A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 9.
Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free.
Here you can find the meaning of A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of30 m/s. The average velocity of the body during the whole journey isa)0b)25 m/sc)20 m/sd)none of theseCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 9 tests.
|
|
Explore Courses for Class 9 exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup