The weight of a body a distance 2R from the centre of the earth of radius 'R' is 2.5 N. If the distance is 3R from the centre of the earth the weight of the body will be

Options

A. 1.1 N
B. 2.1 N
C. 3.1 N
D. 4.1 N

Answer

a

Explanation

`(F_(2))/(F_(1))=((R_(2))/(R_(1)))^(2)=((2R)/(3R))^(2)=(4)/(9)`
`F_(2)=(200)/(4)=50`
`F_(2)=(4)/(9)xx2.5=(10)/(9)=1.1N`