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Q: A boy of 50 kg mass climbs 44 stairs in 10 seconds. If the height of each stair is 15cm then find his power?
  • A. 337.5ms
  • B. 387.5W
  • C. 330J
  • D. 330W
Correct Answer: Option D - Given, mass of body, m = 50 kg h = 44 x15 = 660 cm = 6.60 m t = 10 s, g = 10 m/s2 PE = mgh = 50 x 10 x 6.60 = 3300 J Power consumed by the boy=PE/time=3300/10=330 W
D. Given, mass of body, m = 50 kg h = 44 x15 = 660 cm = 6.60 m t = 10 s, g = 10 m/s2 PE = mgh = 50 x 10 x 6.60 = 3300 J Power consumed by the boy=PE/time=3300/10=330 W

Explanations:

Given, mass of body, m = 50 kg h = 44 x15 = 660 cm = 6.60 m t = 10 s, g = 10 m/s2 PE = mgh = 50 x 10 x 6.60 = 3300 J Power consumed by the boy=PE/time=3300/10=330 W