Questions
A body of mass m is released from a height equal to the radius R of the earth. What will be the velocity of the body when it strikes the surface of the earth?
a
gR
b
2gR
c
2gR
d
gR2
detailed solution
Correct option is A
By conservation of mechanical energy−GMm2R+0=−GMmR+12mv2 ⇒ v=GMR=GMR2R=gRTalk to our academic expert!
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