Question

A stone having weight 5kgf is kept the roof of a building of height 50m.Calculate the amount of energy stored in the body.[take:1kgf=1N]​

Answer 1

Given:-

✦Mass of the stone = 5 kg

✦Height of the stone = 50 m

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To Find :-

✦The amount of stored energy in the stone.

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Analysis :-

✦We are given with the mass, height and the acceleration due to gravity of the stone.

✦In order to find the amount of stored energy in the stone substitute the values such that potential energy is equal to mass multiplied to height multiplied to the gravity.

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Solution:-

✦Using Formula,

➸ Potential Energy = Mass × Gravity × Height

✦Substitute the value given in question in Formula,

➸ Potential Energy = 5 × 10 × 50

➸ Potential Energy = 50 × 50

➸ Potential Energy = 2500 J

✦Hence,The amount of energy stored in the body is 2500J

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Answer 2

The energy stored in the stone will be the potential energy

mass of the stone m = 2kg

Height h = 60 m

The potential energy of the stone:

$: \implies \sf{PE = 2 \times 10 \times 60} \\ : \implies \sf{PE = 1200 \: Joule}$

Ans.➠ $\therefore$ The amount of energy stored in the body is 1200 Joule.