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A student carries a bag weighing 5 kg from the ground floor to his class on the first floor that is 2 m high. The work done by the boy is
- a)1 J
- b)10 J
- c)100 J
- d)1000 J
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A student carries a bag weighing 5 kg from the ground floor to his cla...
Calculation of Work Done
To calculate the work done by the boy, we need to use the formula:
Work = Force x Distance
Where force is the weight of the bag, and distance is the height the bag is lifted.
Converting the weight of the bag from kg to N (Newton) using the formula:
Weight = Mass x Gravity
Where mass is in kg and gravity is 9.8 m/s²
Weight of the bag = 5 kg x 9.8 m/s²
Weight of the bag = 49 N
Therefore, the force exerted by the boy is 49 N.
Distance the bag is lifted = 2 m
Substituting the values into the formula:
Work = 49 N x 2 m
Work = 98 J
Therefore, the work done by the boy is 98 J.
Answer Verification
The answer given in the options is 100 J, which is the nearest rounded-off value to the calculated value of 98 J. Hence, the correct answer is option C, 100 J.
To calculate the work done by the boy, we need to use the formula:
Work = Force x Distance
Where force is the weight of the bag, and distance is the height the bag is lifted.
Converting the weight of the bag from kg to N (Newton) using the formula:
Weight = Mass x Gravity
Where mass is in kg and gravity is 9.8 m/s²
Weight of the bag = 5 kg x 9.8 m/s²
Weight of the bag = 49 N
Therefore, the force exerted by the boy is 49 N.
Distance the bag is lifted = 2 m
Substituting the values into the formula:
Work = 49 N x 2 m
Work = 98 J
Therefore, the work done by the boy is 98 J.
Answer Verification
The answer given in the options is 100 J, which is the nearest rounded-off value to the calculated value of 98 J. Hence, the correct answer is option C, 100 J.
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Community Answer
A student carries a bag weighing 5 kg from the ground floor to his cla...
Mass = 5kg S = 2m
Force = m × g= 5×10= 50N
Work = force × displacement W = 50 × 2W = 100 J
Force = m × g= 5×10= 50N
Work = force × displacement W = 50 × 2W = 100 J
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A student carries a bag weighing 5 kg from the ground floor to his class on the first floor that is 2 m high. The work done by the boy isa)1 Jb)10 Jc)100 Jd)1000 JCorrect answer is option 'C'. Can you explain this answer?
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