The kinetic energy needed to project a body of mass m from the earth's surface to infinity is

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Solution

Q.
The kinetic energy needed to project a body of mass $m$ from the earth's surface to infinity is (R is the radius of the earth)

1 $\frac{1}{4} m g R$

2 $\frac{1}{2} m g R$

3 $m g R$

4 $2 m g R$

Ans.
(3)

$\frac{1}{2} M v_{e}^{2}$

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