Physics (AS & A Level) · Oct / Nov 2025 · Paper 14 · Question 11

A moving object X collides with a stationary object Y. The objects separate after the collision. The collision is perfectly elastic and there are no external forces acting. Which word equation is not correct?

1. Aduring the collision, (force acting on object X) + (force acting on object Y) = zero
2. B(relative speed of approach of X and Y) + (relative speed of separation of X and Y) = zero
3. C(total kinetic energy before collision) = (total kinetic energy after collision)
4. D(total momentum before collision) = (total momentum after collision)

As printed in the paper