Gravitational potential difference between a point on surface of planet and another point 10 m above is 4J/kg. Considering gravitational field to be uniform, how much work is done in moving a mass of 2kg from the surface to a point 5 m above the surface?

Options

A. 4 J
B. 5 J
C. 6 J
D. 7 J

Answer

A

Explanation

Gravitational fiedl
`g=(DeltaV)/(DeltaX)=-((-4)/(10))=(4)/(10)J//kg-m`
Work done in moving a mass of 2 kg from the surface to a point 5 m above the surface.
`W="mgh"=(2" kg")((4)/(10)(J)/(kg-m))(5" m")=4" J"`