A-LevelPhysicsDynamics9702/12 · May/June 2015 · Q111 Mark

Trolley X, moving along a horizontal frictionless track, collides with a stationary trolley Y. The two trolleys become attached and move off together. Which statement about this interaction is correct?

ASome of the kinetic energy of trolley X is changed to momentum in the collision.

BSome of the momentum of trolley X is changed to kinetic energy in the collision.

CTrolley X loses some of its momentum as heat in the collision.

DTrolley X shares its momentum with trolley Y but some of its kinetic energy is lost.

✓ Correct answer

D: Trolley X shares its momentum with trolley Y but some of its kinetic energy is lost.

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