A 15-Kg Object Sitting at Rest Is Struck Elastically in a Head-On

Multiple Choice

A 15-kg object sitting at rest is struck elastically in a head-on collision with a 12-kg object initially moving at +3.0 m/s.Find the final velocity of the 15-kg object after the collision.

A) −1.0 m/s
B) −3.0 m/s
C) +5.0 m/s
D) +3.0 m/s
E) ​+11.0 m/s