The kinetic energy needed to project a body of mass m from the earth's surface to infinity is.
The kinetic energy needed to project a body of mass m from the earth's surface to infinity is
(a) 1/4 mgR
(b) 1/2 mgR
(c) mgR
(d) 2 mgR.
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(c) mgR.
EXPLANATION:
The kinetic energy should be equal to the gravitational potential energy K=U = GMm/R.
Since g = GM/R² →GM =gR²
Hence, K = gR²*m/R =mgR
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