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A man of mass 50kg ascends a flight of stains 5m high in 5 s...

A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms2 the power expended is

A.

100w

B.

200w

C.

400w

D.

500w

Correct answer is D

Power is the time rate of doing work

i.e power = energytime

Since energy = mgH

∴ power = mgHt

= 50×10×5t

= 500W