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Matter In Our Surroundings
Question
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A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain ? Take g = 9.8 m/s2.

Answer

Mass of the boy, m = 50 kg

Acceleration due to gravity, g = 9.8 m/s2

Vertical height that the boy climbed up, h = 100 m

Work done by the boy = mgh

                                  = 50 x 9.8 x 100

                                  = 49000 J

                                  = 4.9 x 104 J


Gain in P.E. = Work done = 4.9 x 104 J.

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