Given that mass of earth is M and its radius is R. A body is dropped from a height equal to the radius of earth above the surface of earth. When it reaches the ground, its speed will be:
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a
GMR
b
GM2R
c
2GmR
d
2GmR
answer is A.
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Detailed Solution
By using conservation of mechanical energy−GMm2R+0=−GMmR+12mv2⇒v=GMR