Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Body having mass moving with speed has head-on collision elastically with another body having mass initially at rest. If , body will have a maximum speed equal to after collision.
Reason R : During elastic collision, the momentum and kinetic energy are both conserved.
In the light of the above statements, choose the most appropriate answer from the options given below: