Question

A body of mass 10kg at height of 500m from the earth has energy of 850 kj its moving with velocity nearly equal to

Answer 1

Given :

Mass of the body, m = 10 kg

Initial velocity, u =19.6ms−1

Potential energy (P.E.) at highest point =?

For this, first we have to find maximum height, h =?

The maximum height reached by a body is given by h =2gu2

⇒h2×10(19.6)2=20384.16=19.208m

Therefroe, potential energy at maximum height is, P.E. = mgh

⇒P.E.=10×10×19.208=1920.8J