Question

A man carrying a box of mass 20 kg climbs up to a height of 10 m in 40 s. Calculate the power delivered by him to the box ?

Answer 1

Answer:

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/t = 3000/30= 100 w

Explanation:

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Answer 2

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