A stone of weight 1 N falls downwards. Its g. p.e.
decreases by 100 J. How far has it fallen?

h = 100 m

Explanation:

Given that,

The weight of a stone, W = 1 N

It falls downwards. Its gravitational potential energy decreases by 100 J.

We need to find how far it is fallen.

The gravitational potential energy of an object is given by :

E = mgh

h is from where it has fallen

So, it has fallen 100 m.

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.