Question on: JAMB Physics - 2017

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
Ask EduPadi AI for a detailed answer
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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