Cart 1 (2 kg) and Cart 2 (2.5 kg) run along a frictionless, level, one-dimensional track. Cart 2 is initially at rest, and Cart 1 is traveling 0.6 m/s toward the right when it encounters cart 2. What is the efficiency of the collision with respect to kinetic energy?

A 16%

B 65%

C 44.44%