From the law of conservation of momentum:

$\overline{){\mathbf{M}}{\mathbf{o}}{\mathbf{m}}{\mathbf{e}}{\mathbf{n}}{\mathbf{t}}{\mathbf{u}}{\mathbf{m}}{\mathbf{}}{\mathbf{b}}{\mathbf{e}}{\mathbf{f}}{\mathbf{o}}{\mathbf{r}}{\mathbf{e}}{\mathbf{}}{\mathbf{c}}{\mathbf{o}}{\mathbf{l}}{\mathbf{l}}{\mathbf{i}}{\mathbf{s}}{\mathbf{i}}{\mathbf{o}}{\mathbf{n}}{\mathbf{=}}{\mathbf{M}}{\mathbf{o}}{\mathbf{m}}{\mathbf{e}}{\mathbf{n}}{\mathbf{t}}{\mathbf{u}}{\mathbf{m}}{\mathbf{}}{\mathbf{a}}{\mathbf{f}}{\mathbf{t}}{\mathbf{e}}{\mathbf{r}}{\mathbf{}}{\mathbf{c}}{\mathbf{o}}{\mathbf{l}}{\mathbf{l}}{\mathbf{i}}{\mathbf{s}}{\mathbf{i}}{\mathbf{o}}{\mathbf{n}}}$

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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