Physics (AS & A Level) · Oct / Nov 2018 · Paper 12 · Question 9
9702Linear momentum and its conservation
Two bodies travelling along the same straight line collide in a perfectly elastic collision. Which statement must be correct?
- AThe initial speed of one body will be the same as the final speed of the other body.
- BThe relative speed of approach between the two bodies equals their relative speed of separation.
- CThe total momentum is conserved but the total kinetic energy will be reduced.
- DOne of the bodies will be stationary at one instant.
As printed in the paper
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Correct answer: B. The relative speed of approach between the two bodies equals their relative speed of separation.
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