Question

a man of mass 100 kg runs up a staircase 30 steps in 20s. if the height of each steps is 10cm, find (1) work done by the man (2)power of the man​

Answer 1

Answer:

Solution

Given that,

A man whose mass is 50kg climbs up 30 steps of a stair in 30s each step is 20 cm high

Height at 30 steps, h = 30 × 0.2 = 6 m

Change in potential energy, = mgh = 50 ×

10 × 6 = 3000 J

So, Work done by the man, W = 3000 J

Power used, P = W = 3000 = 100 W

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t 30

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