A ball of mass M moving with velocity V collides elastically with another ball of mass m at rest. If after the collision the first ball comes to rest, then what will be velocity of second ball?

Q: A ball of mass M moving with velocity V collides elastically with another ball of mass m at rest. If after the collision the first ball comes to rest, then what will be velocity of second ball?

(a) V/2

(b) V

(c) 2 V

(d) 4 V

Ans: (b)