Question

A body of mass 2 kg is thrown vertically upwards with an initial velocity of 25m/s find its maximum potential energy

Answer 1

Potential energy due to gravitational force is given as, P.E. = mgh

We have, u = 20 m/s, a = –10 m/s2, t = 2 s, s = h1

Hence potential energy after 2s, P.E.1 = (2 kg) � (10m/s2) � (20 m) = 400 J

Hope this helps you.

Answer 2

Mass of a body is given 2 Kg
Initial velocity is 25m/s
Hence the formula of Kinetic energy is = 1 mv²
                                                                     ____
                                                                         2
first we have to convert Kg into g
2 × 1000 = 2000gm

now  put the value;

2000  ×  (25)² = 2000 × 625 = 1250000 gm²/s