A moving object X strikes a stationary object Y. After the collision, the objects move apart. The collision is perfectly elastic and no external forces act. Which word equation is not correct?
- Aduring the collision, (force acting on object X) + (force acting on object Y) = zero
- B(relative speed of approach of X and Y) + (relative speed of separation of X and Y) = zero
- C(total kinetic energy before collision) = (total kinetic energy after collision)
- D(total momentum before collision) = (total momentum after collision)