A 0280-Kg Ball Makes an Elastic Head-On Collision with a Second

Multiple Choice

A 0.280-kg ball makes an elastic head-on collision with a second ball initially at rest.The second ball moves off with one fourth the original speed of the first ball.The mass of the second ball is

A) 1.12 kg.
B) 0.280 kg.
C) 2.24 kg.
D) 1.96 kg.
E) 0.560 kg.