Question

A man mass 86 kg climbs 40 steps of a staircase , each measuring 15 cm high the potential energy gained by the boy

Answer 1

Potential energy = mgh
= 86 kg × 10 m/s² × 40 steps × 0.15 m/step
= 5160 Joule

Potential energy gained by man is 5160 Joule

[Note: Actual answer will slightly be different because I took g = 10 m/s² instead of 9.8 m/s²]

Answer 2

Potential energy of a body= mgh
Now the potential energy gained by the man is
=86kg×9.8m/s^2× 0.15m=126.4 joules

now as the man took 40 steps the total potential energy would be=126.4×40=5056 joules

therefore the man exhibits a potential energy of 5056 joules


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