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The work done to remove a body of mass 2...

The work done to remove a body of mass 2kg from the surface of the earth of radius 'R' and 'g' acceleration due to gravity of values 6400 km and `10m//s^(2)` respectively to infinity is

A

`1.28J`

B

`1.28xx10^(8)J`

C

`10^(8)J`

D

`0.128xx10^(8)J`

Text Solution

Verified by Experts

The correct Answer is:
b
`B.E.=(GMm)/(R)=(gR^(2)m)/(R)`
`=mgR`
`=2xx10xx6.4xx10^(6)`
`=128xx10^(6)`
`=1.28xx10^(8)J.`
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