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Q: A boy of 50 kg mass climbs 40 stairs in 9 seconds. If the height of each stair is 15cm, then find his power.(g= 10ms-² )
  • A. 333.33W
  • B. 333.34J
  • C. 333.34ms
  • D. 387.5W
Correct Answer: Option A - Height of 40 stairs = 40 x15=600cm=6m m = 50 kg, h = 6 m, g = 10 m/s² Work done = mgh = 50 × 10 × 6 = 3000J Power = work done/time=3000/9=333.33Watt
A. Height of 40 stairs = 40 x15=600cm=6m m = 50 kg, h = 6 m, g = 10 m/s² Work done = mgh = 50 × 10 × 6 = 3000J Power = work done/time=3000/9=333.33Watt

Explanations:

Height of 40 stairs = 40 x15=600cm=6m m = 50 kg, h = 6 m, g = 10 m/s² Work done = mgh = 50 × 10 × 6 = 3000J Power = work done/time=3000/9=333.33Watt