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Q.

The gravitational potential energy of a body of mass ‘m’ at the earth’s surface −mgRe . Its gravitational potential energy at a height  Re from the earth’s surface will be (Here  Re is the radius of the earth)

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a

−2 mgRe

b

2 mgRe

c

12mgRe

d

−12mgRe

answer is D.

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Detailed Solution

ΔU=U2−U1=mgh1+hRe=mgRe1+ReRe=mgRe2⇒U2−−mgRe=mgRe2⇒U2=−12mgRe
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