AP Physics 1hardmcq1 pt
A 1500 kg car moving north at 20 m/s collides and sticks with a 1000 kg car moving south at 10 m/s. Their common velocity is
A.8.0 m/s north
B.8.0 m/s south
C.14 m/s north
D.5.0 m/s north
Explanation
Core Concept
Total momentum = (1500)(20) − (1000)(10) = 20000 kg·m/s north; v = 20000/2500 = 8.0 m/s north.
Correct Answer
A8.0 m/s north
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