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

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

Gravitation

Solution:

Energy required $=($ Final potential-Initial potential $) m$
Energy required $=-\frac{ GMm }{3 R }-\frac{- GMm }{2 R }=\frac{ GMm }{6 R }$