Gravitational potential difference between surface of a planet and a point situated at a height of 20 m above its surface is 2joule/kg. if gravitational field is uniform, then the work done in taking a 5kg body of height 4 meter above surface will be-:

Options

A. 2 Joule
B. 20 Joule
C. 40 Joule
D. 10 Joule

Answer

a

Explanation

`I_(8)=(v_(g))/(r)=(2)/(20)=(1)/(10)=g_(2)`
`W=mg_(2)h`
`=5xx(1)/(10)xx4=25.`