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A man of mass 50kg ascends a flight of stains 5... - JAMB Physics 2017 Question

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: d

Power is the time rate of doing work

i.e power = (\frac{\text{energy}}{\text{time}})

Since energy = mgH

∴ power = (\frac{mgH}{t})

= (\frac{50 \times 10 \times 5}{t})

= 500W

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