Question

it's answer is a but why not c... That means the same thing​.​

Answer 1

Answer:

NOOOOOOOOOOOOOOOOOOO

Explanation:

Answer : A

Option C is wrong.

The kinetic energies of the bodies may change.It may not be constant.But the sum of the kinetic energies initially will be equal to the sum of kinetic energies of the final case.

Kinetic energy does not remain constant but the "Total" kinetic energy is constant.

But then :

"initial total kinetic energy" should be equal to "final total kinetic energy".