Q.

The change in potential energy, when a body of mass m is raised to a height nR from the earth's surface is (R = Radius of earth)

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a

mgRnn−1

b

nmgR

c

mgRn2n2+1

d

mgRnn+1

answer is D.

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Detailed Solution

ΔU=mgh1+hR=mg nR1+nRR=nm gRn+1
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