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Question: 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

14\frac { 1 } { 4 }mg R

B

12\frac { 1 } { 2 } mg R

C

mg R

D

2mg R.

Answer

mg R

Explanation

Solution

ER – = 0

or ER =

or ER =

or ER = mgR