12. A boy weighing 350 N climbs up 30 steps, each
20 cm high in 1 minute. Calculate :
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Answer:
weight = 350 n
height = height of one step × no of step
0.2× 30
6m
work done = p.e = mgh
work done = 350 × 6 = 2100 j
power = work done/ time
2100 / 60
35w
( 1 minute = 60 seconds)
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