AP Physics 1mediummcq1 pt
A 0.1 kg ball moving at 5 m/s collides with a 0.2 kg ball at rest. If the 0.1 kg ball stops after the collision, what is the velocity of the 0.2 kg ball?
A.1 m/s
B.2.5 m/s
C.5 m/s
D.10 m/s
Explanation
Core Concept
Conservation of momentum: (0.1)(5) + (0.2)(0) = (0.1)(0) + (0.2)(v). So 0.5 = 0.2v, v = 2.5 m/s.
Correct Answer
B2.5 m/s
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