Question

A man weight 60kg climbs up a stair case with a a 20 kg load on his head. the stair case has 20 steps and each step has a height 20 cm. The Increase in potential energy of the man is (g=10 ms^-2).

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Answer 1

Step-by-step explanation:

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Total work done by man in covering 20 steps =mgh=80×10×0.2×20=3200J

So, Power(P) =

Time taken

Work done

=

10/3200

=320Watt

Answer 2

Weight (m) =(60+20) kg

80kg

Height (h) = 20cm

0.2m

Acceleration due to gravity (g) = 10m/s²

We know,

Work done (w) =mgh

80×10×0.2

3200j

Now,

Power (p) =Work Done/Time taken

3200/10

320W

HOPE IT HELPS YOU