Class 9 Exam > Class 9 Questions > a car is travelling with a velocity of 72 km ...
Start Learning for Free
a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop.
Verified Answer
a car is travelling with a velocity of 72 km h .if brakes are applied ...
Initial velocity (u) = 72 km/h = 20 m/s
Final velocity (v) = 0
Acceleration (a) = - 10 m/s^2
Time taken to stop (t) = ?
We know,
v - u = at
0 - 20 = -10 x t
-20 = -10t
-20/-10 = t
t = 2 s
Time taken to stop = 2 seconds.
This question is part of UPSC exam. View all Class 9 courses
Most Upvoted Answer
a car is travelling with a velocity of 72 km h .if brakes are applied ...
Given data:
- Velocity of the car, v = 72 km/h
- Retardation, a = 10 m/s²
To calculate:
- Time taken to stop the car
Conversion of units:
- We need to convert the velocity from km/h to m/s to match the unit of acceleration.
- 1 km/h = 1000 m/3600 s = 5/18 m/s
- Therefore, the velocity of the car in m/s is:
v = 72 km/h × (5/18 m/s) = 20 m/s
Using the equation of motion:
- We can use the equation of motion to find the time taken to stop the car:
v = u + at
Where,
v is the final velocity (0 m/s as the car stops),
u is the initial velocity (20 m/s),
a is the acceleration (retardation of 10 m/s²),
t is the time.
Substituting the values:
0 = 20 m/s + (-10 m/s²) × t
Simplifying the equation:
- Multiplying the acceleration by time:
0 = 20 m/s - 10 m/s² × t
10 m/s² × t = 20 m/s
- Dividing both sides by 10 m/s²:
t = 20 m/s / 10 m/s²
t = 2 s
Therefore, the car takes 2 seconds to stop.
- Velocity of the car, v = 72 km/h
- Retardation, a = 10 m/s²
To calculate:
- Time taken to stop the car
Conversion of units:
- We need to convert the velocity from km/h to m/s to match the unit of acceleration.
- 1 km/h = 1000 m/3600 s = 5/18 m/s
- Therefore, the velocity of the car in m/s is:
v = 72 km/h × (5/18 m/s) = 20 m/s
Using the equation of motion:
- We can use the equation of motion to find the time taken to stop the car:
v = u + at
Where,
v is the final velocity (0 m/s as the car stops),
u is the initial velocity (20 m/s),
a is the acceleration (retardation of 10 m/s²),
t is the time.
Substituting the values:
0 = 20 m/s + (-10 m/s²) × t
Simplifying the equation:
- Multiplying the acceleration by time:
0 = 20 m/s - 10 m/s² × t
10 m/s² × t = 20 m/s
- Dividing both sides by 10 m/s²:
t = 20 m/s / 10 m/s²
t = 2 s
Therefore, the car takes 2 seconds to stop.
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 car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop.
Question Description
a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. 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 car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop..
a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. 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 car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop..
Solutions for a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. 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 car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. defined & explained in the simplest way possible. Besides giving the explanation of
a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop., a detailed solution for a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. has been provided alongside types of a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. theory, EduRev gives you an
ample number of questions to practice a car is travelling with a velocity of 72 km h .if brakes are applied produce uniform retardation of 10 m s .calculate the time taken to stop. 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