Question

A body of mass m is moving with certain speed suffer an elastic collision with the body of mass m at rest. The ratio of final kinetic energy to initial kinetic energy

Answer 1

Please go through the attachment.

I hope you will understand :)

Answer 2

Answer:

A body of mass m is moving with certain speed suffer an elastic collision with the body of mass m at rest. The ratio of final kinetic energy to initial kinetic energy.

Explanation:

Initial momentum of the system =mv

Body of mass m is at rest

The mass of the composite body is (m+m), V is considered as the speed .

its momentum will be (m+m)V

We have ,mv =(m+m)V

or V =(m/2m)v

Initial K.E=1/2mv2

Final K.E=1/4mV2

Final K.E /Initial K.E = 1/4m×V2/1/2mv2

                                   1/4m×1/2×v/1/2mv2

                                    =1/4v

#SPJ3