A railway car having a total mass of 5.8 105 kg, moving with a speed of 9.1 km/h, strikes another car that has a mass of 8.7 105 kg and is initially at rest. The speed of the coupled cars after the collision is
A) 9.1 km/h.
B) 7.2 km/h.
C) 3.6 km/h.
D) 1.8 km/h.
E) 4.2 km/h.
Correct Answer:
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