Energy required to move a body of mass m from an orbit of radius 2R to 3R is:

GMm12R2

GMm3R2

GMm8R

GMm6R

A

GMm3R2

B

GMm6R

C

GMm12R2

D

GMm8R

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Solution

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Energy required=(Final potential-Initial potential)m

Energy required=−GMm3R−−GMm2R=GMm6R

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