Question

4 A man whose mass is 60 kg walks up 15 steps, each 30cm high, in 15s.
Find the power he develops.​

Answer 1

Answer:

88.2

Explanation:

each step = 30cm

15 steps = 30×15= 450 cm = 4.5m

now, power = W/Time

for work to be done we need force × displacement

force= mg

therefore W= mgh

= 60 × 9.8 × 4.5

= 2646 J

power = W/T

= 2646 ÷ 30

= 88.2 watt. ans..

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