Question

A body A of mass 20 kg is moving with a velocity of 1 m s−1 . Another body B of mass 1kg is moving with a velocity of 20m s−1. Find the ratio of kinetic energy of A and B

Answer 1

Answer:

K.E= ½ mv²

In the first case the body's mass(m)=20kg

velocity(v)= 1 m/s

So, K.E= ½ 20.1²

K.E = 10

In the second case the body's mass(m)= 1kg

velocity(v)= 20m/s

So, K.E= ½ 1.20²

=20

Ratio between Kinetic energies of the bodies A and B = A/B

10/20= 1/2

=0.5