Question

A boy weighing 40 kg climbs up a vertical height of 200 m. Calculate the amount of
work done by him. How much potential energy does he gain? ( g = 9.8 m /s2).


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Answer 1

Answer:

Given,

mass of boy = m = 40 kg

height = h = 200m

since boy does not move anything with his force, work done by him is zero

work done on the boy = gain in potential energy

P.E=mgh

P.E=40×9.8×200

P.E=76400.0KJ

so, potential energy gained by boy is 76400KJ

Explanation:

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Answer 2

Given:-

◆ Mass of boy = m = 50kg

◆ Height = h = 100m

Explanation:-

● Since boy does not move anything with his force,work done by him is zero.

● Work done on the boy = gain in potential energy.

◆ P.E = megh

◆ P.E = 50×9.8×100

◆ P.E = 49KJ

Result:-

● So, potential energy gained by boy is 49KJ.