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The kinetic energy needed to project a b...

The kinetic energy needed to project a body of mass m from the eath surface (radus R) to infinity is

A

`mgR/2`

B

`2mgR`

C

`mgR`

D

`mgR/4`

Text Solution

Verified by Experts

The correct Answer is:
C
(c ) `K.E = (1)/(2) mv_e^2 where v_c = escape velocity = sqrt(2gR)`
`:. K.E. = (1)/(2) mxx 2gR =mgR`
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