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.What is the velocity of the first ball after the collision,in terms of its initial velocity,v?

A) -0.16v
B) +0.16v
C) -0.25v
D) +0.25v
E) 0
F) +0.75v
G) -0.75v