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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  is Re the radius of the earth)

(a)    -2 mgR e                         (b) 2 mgR e

(c)     1/2 mgR e                       (d) -(1/2) mgR e

Answer:  d

(4)

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