Q. 3 A4.6( 9 Votes )

Rewrite the following sentences using proper alternative.

The potential energy of your body is least when you are …..

i. sitting on a chair

ii. sitting on the ground

iii. sleeping on the ground

iv. standing on the ground

Answer :

Option(iii) sleeping on the ground

Explanation: Potential energy of any object depends upon its height from the surface of earth, We know the Relation for Potential energy of an object of mass m due to earth’s gravity(g is acceleration due to gravity) held at an height h above ground is


P.E. = mgh


So more is the height of body from ground more is the potential energy and less is the height of body from ground less is the potential energy


Now in case of human body height of body from ground is measured from center of mass of the body which is the point where all mass of the body is assumed to be concentrated , the position of which is near the stomach in human body , so potential energy of body will be least in case of a person sleeping because in that situation height of centre of mass of the body will be minimum from ground.


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