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Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 4 - Work And Energy

Question 38 Exercise

A boy weighing 50kg climbs up a vertical height of 100m. Calculate the amount of work done by him. How much potential energy does he gain?

Answer:

Height, h = 100m

Acceleration due to gravity, g = 9.8 m/s^2

Work done by the boy, W = mgh = 49kJ

Potential energy gained = work done by the boy = 49kJ

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