Question
Cart A is moving with an initial velocity +v (in the positive direction) toward cart B, initially at rest. Both carts have equal mass and are on a frictionless surface. Which of the following statements correctly characterizes the velocity of the center of mass of the system before and after the collision?
1. $\dfrac{+v}{2}$ before, $\dfrac{-v}{2}$, after
2. $\dfrac{+v}{2}$ before, 0 after
3. $\dfrac{+v}{2}$ before, $\dfrac{+v}{2}$ after
4. 0 before, 0 after

(c)

Solution Video