Physics (AS & A Level) · Feb / March 2019 · Paper 12 · Question 8

Two balls X and Y are moving towards each other with speeds of 5 m s⁻¹ and 15 m s⁻¹ respectively. They make a perfectly elastic head-on collision and ball Y moves to the right with a speed of 7 m s⁻¹. What is the speed and direction of ball X after the collision?

1. A3 m s⁻¹ to the left
2. B13 m s⁻¹ to the left
3. C3 m s⁻¹ to the right
4. D13 m s⁻¹ to the right

As printed in the paper