A person with mass 60 kg climbs the stairs to the first floor 10 m above the ground in 20 s. The power developed by him is: (g = 10 m/s2)
Correct answer: C. 300 W
- A. 120 W
- B. 60 W
- C. 300 W
- D. 294 W
Explanation
We use the formula of power, P = W/t = mgh/tP = PE/t = mgh/t = (60)(10)(10)/20 = 300 wattHence, this is the correct option.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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