Question

A ball is drop from height 10 m.Find the height at which PE =2KE

Answer 1

Answer:

5 m

Explanation:

Given, h = 10 m

and PE = 2 KE, the height to be determined be x.

So, mgh = 2 x 1/2 m v (sq).

or gh = v (sq.)

or gh = 2gx (u=o, hence v (sq) = 2gx)

or x = h/2

or x = 10/2

or x = 5 m

Hence Answer is 5 m.

Hope this will serve you..