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Sunday, 15 March 2026
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A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due ...

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
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  • A 100w
  • B 200w
  • C 400w
  • D 500w
Correct Answer: Option D
Explanation:
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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