# Momentum And A Car Collision

I am studying an example problem, concerning the very topic mentioned in the title. In this example problem, a car has a head-on collision with the wall; the initial and final velocity are known, as well as the mass. My question is, why does the car rebound off of the wall? Why doesn't the normal force of the wall reduce the car's velocity to zero, with the car remaining there, instead of reducing the car's velocity to zero, and then giving it a velocity in the opposite direction?

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–  RedGrittyBrick Nov 17 '12 at 23:41
If the car was stationary after the collision, momentum would not be conserved since: ${\vec{p}} = m\vec{v}$