From the law of conservation of momentum:
A car with a mass of 800 kg, moving at +15 m/s, crashes head on with a 1500 kg truck moving at -45.5 m/s in the opposite direction. If the two cars become intertwined, with what velocity does the wreckage move?
a. 14.5 m/s
b. -24.5 m/s
c. - 14.5 m/s
d. 24.5 m/s
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