Question

A body of mass m moving with velocity V makes a head-on elastic collision with another body of mass 2m which is initially at rest. The ratio of kinetic energies of colliding body before and after collision will be -

(A) 9 : 1

(B) 1 : 1

(C) 4 : 1

(D) 2 : 1

Answer 1

Correct option (A) 9 : 1

Explanation:

Using moment of conservation