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
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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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