A-LevelPhysicsDynamics9702/12 · May/June 2016 · Q111 Mark
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. [Figure 11.1] A student writes three equations relating to the collision. Which row in the table indicates the correct and incorrect equations?
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Amu = MV + mv: correct, mv sin 30° = MV sin 40°: correct, mv cos 30° + MV cos 40°: correct
Bmu = MV + mv: incorrect, mv sin 30° = MV sin 40°: correct, mv cos 30° + MV cos 40°: incorrect
Cmu = MV + mv: correct, mv sin 30° = MV sin 40°: incorrect, mv cos 30° + MV cos 40°: incorrect
Dmu = MV + mv: incorrect, mv sin 30° = MV sin 40°: correct, mv cos 30° + MV cos 40°: correct
✓ Correct answer
D: mu = MV + mv: incorrect, mv sin 30° = MV sin 40°: correct, mv cos 30° + MV cos 40°: correct
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