Question

Gravitational potential difference between surface
of a planet and a point situated at a height of 20m
above its surface is 2 J/kg. If gravitational field is
uniform, then the work done in taking a 5kg body
upto height 4 meter above surface will be :
(1) 2 J (2) 20 J (3) 40 J (4) 10 J​

Answer 1

Answer:

The potential difference for a distance of 20m is 2 joule/kg.

Now work done =m× potential difference.

Thus work done for a distance of 4m for a mass 5kg, W=

20

4

×2×5

⟹W=2J