In this problem we will consider a collision of two moving objects such that after the collision, the objects stick together and travel off as a single unit. The collision is therefore completely inelastic.

the magnitude of the momentum only 
the net momentum (considered as a vector) only 
the momentum of each object considered individually
The answer depends on the directions in which the cars were moving before the collision. 
The answer depends on the directions in which the cars were moving before the collision. 
4 Two cars collide inelastically and stick together after the collision. Before the collision, their momenta are and . After the collision, their combined momentum is . Of what can one be certain?
5 Two cars collide inelastically and stick together after the collision. Before the collision, the magnitudes of their momenta are and . After the collision, the magnitude of their combined momentum is . Of what can one be certain?

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