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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 surface of the earth to infinity is

A

`12xx10^(7)J//kg`

B

`12.5xx10^(7)J//kg`

C

`6.25xx10^(7)J//kg`

D

`25xx10^(7)J//kg`

Text Solution

Verified by Experts

The correct Answer is:
c
`"K E = BE"=("GMm")/(R)`
`(KE)/(m)=(gR^(2))/(R)=gR`
`=10xx6.4xx10^(6)=6.4xx10^(7)`
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