Two Bumper Cars on a Frictionless Surface Collide Elastically

Multiple Choice

Two bumper cars on a frictionless surface collide elastically.The first bumper car is moving to the right with a speed of 22.0 m/s and rear-ends a bumper car also moving to the right with a speed of 5.00 m/s.What is the speed of the first bumper car after the collision (in m/s) ? The mass of the first bumper car is 192 kg and the mass of the second bumper car is 144 kg.Assume that the collision takes place in one dimension.

A) 3.9643
B) 4.6382
C) 5.4267
D) 6.3492
E) 7.4286