Questions  

A body of mass m kg. starts falling from a point  2R above the Earth’s surface. Its kinetic energy when it has fallen to a point ‘R’ above the Earth’s surface [R-Radius of Earth, M-Mass of Earth, G-Gravitational Constant]

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By Expert Faculty of Sri Chaitanya
a
12GMmR
b
16GMmR
c
23GMmR
d
13GMmR
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detailed solution

Correct option is B

Potential energy U=−GMmr=−GMmR+hUini​​tial=−GMm3R and Ufinal=−−GMm2RLoss in PE = gain in KE=GMm2R−GMm3R=GMm6R

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