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Potential Energy

nbsp;A man of...

Question

A man of mass 80kgs climbs up 30 steps of stairs in 30s. If each step is 12.5cm in height. Calculate the power used in climbing up the stairs(Given g=10m/s² )

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Solution

h = 30 x 12.5 cm = 375 cm = 3.75 m
Work done = potential energy = mgh
Power = 80x10x3.75/30 = 100 J-s

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