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Question

A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is


A

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B

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C

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D

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Solution

The correct option is C


K.E.=U
12MV2=GMeM(1R1R+h)....(i)
Also g=GMeR2
On solving (i) and (ii) h=R(2gRV21)


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