Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 11

A ball of mass m travelling at velocity u collides with a stationary ball of mass M. After collision the two balls travel at velocities v and V respectively, in the directions shown. A student writes three equations relating to the collision. Which row in the table indicates the correct and incorrect equations? | | mu = MV + mv | mv sin 30° = MV sin 40° | mu = mv cos 30° + MV cos 40° | |---|---|---|---| | A | correct | correct | correct | | B | incorrect | correct | incorrect | | C | correct | incorrect | incorrect | | D | incorrect | correct | correct |

1. Acorrect, correct, correct
2. Bincorrect, correct, incorrect
3. Ccorrect, incorrect, incorrect
4. Dincorrect, correct, correct

As printed in the paper