Question

The kinetic energy needed to project a body of mass m from the earth
surface (radius R) to infinity is
(a) mgR/2 (b) 2mgR
(c) mgR (d) mgR/4

Answer 1

$\huge\fcolorbox{red}{pink}{Answer}$

$\implies \rm \: KE = \frac{1}{2} m {V{ \tiny{e}}}^{2} \\ \\ \implies \rm \: V{\tiny{e}} = escape \: velocity = \sqrt{2gR} \\ \\ \therefore \: \underline{ \boxed{ \bold{ \rm{ \pink{KE= mgR}}}}}$

Answer 2

Answer:

Hey!

The kinetic energy needed to project a body of mass m from the earth

surface (radius R) to infinity is mgR .

HoPe it will be helpful ✌️