height of 20 cm. If he takes 30 seconds to climb the stair case, his power is (approximately)

  1. 540 W

  2. 180 W

  3. 360 W

  4. 90 W

Answers (1)
S Sayak

Total mass of the man and the weight he is carrying = m = 60 + 30 = 90 kg

Total height climbed = h

\\h=30\times 0.2\\ h=6m

Total work done by the man = W

\\W=mgh\\ W=90\times 10\times 6\\ W=5400\ J

Time taken by the man to cmimb the flight of stairs = t = 30 s

Power of the man = P

\\P=\frac{W}{t}\\ P=\frac{5400}{30}\\ P=180\ W

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