A-LevelPhysicsDynamics9702/12 · Oct/Nov 2011 · Q111 Mark
An object of mass 20 kg is travelling at a constant speed of 6.0 ms⁻¹. It collides with an object of mass 12 kg travelling at a constant speed of 15 m s⁻¹ in the opposite direction. The objects stick together. What is the speed of the objects immediately after the collision?
A1.9 ms⁻¹
B9.0 ms⁻¹
C9.4 ms⁻¹
D21 ms⁻¹
✓ Correct answer
A: 1.9 ms⁻¹
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