(adsbygoogle = window.adsbygoogle || []).push({}); 1. When a body of mass 'm' is taken from the surface of the earth to a height equal to the radius of the earth (R) then the change in its Potential energy is______

got the solution as follows:

1)when on the surface of the earth the P.E ismgR(considered it as initial P.E)

when the body is taken to height 'h=R' frm the surface of earth the P.E ismg(R+R) = 2mgR(considered it as final P.E)

.. .change = Final P.E - Initial P.E = 2mgR-mgR= mgR

another approach:

2)on the surface of earth P.E = 0

when raised to "h=R" its P.E = mgR

.

. .change in P.E= mgR

out of these two approaches which is considered to be the best.

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# Homework Help: Potential energy.

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