A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms−2 the power expended is

A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms−2 the power expended is
A. 100w
B. 200w
C. 400w
D. 500w

Correct Option: Answer is D

Power is the time rate of doing work

i.e power = energy/ytime

Since energy = mgH

∴ power = mgH/t

= 50×10×5t = 500W

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