A mass m is raised from a distance 2 R from the surface of the earth to 3 R . Work done to do so against gravity will -

Question

A mass m is raised from a distance 2 R from the surface of the earth to 3 R . Work done to do so against gravity will -, m g R 10, m g R 11, m g R 12, m g R 14

MARKS App · Accepted Answer

U i = - G M m 2 R + R U f = - G M m R + 3 R W = Δ U = U f - U f = G M m 12 R = G M R 2 × m R 12 = m g R / 12

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