Two carts are involved in an elastic collision. Cart A with mass 0.55 kg is moving towards Cart B with mass 0.55 kg, which is initially at rest. Cart A stops after the collision and Cart B begins to move.

Question

What is the final kinetic energy of Cart B?

Answer 1

If A stopped and it was elastic then the B has the same as A had
(1/2)(.55)(v^2)

Answer 2

.06875