Q1: What was his momentum before the collision
Q2: What is his momentum after driving away
Q3: What is the overall change in momentum of the car between the start and end of the story?
Q4: How much momentum did the car lose between the start and end?

Q1:1000 ; the car was initaly traveling at 1000
Q2:1000 ; the car reaccelerated to 1000 after the collision
Q3:1000 ; after the collision the momentum goes to zero
Q4:1000 ; momentum at start is the same at end only opposite direction.

------ my turn ------

there are a total of 42 mases
20 being accelerated
20 free floating
2 in the turnarounds

Q1: how much force does each 100kg mass apply to the pipe in the opposite direction of the movement of the mass if accelerated for a distance of 500 ft at a constant acceleration of 5 m/s/s if initial velocity is zero.
Q2: how much force will be applied to the pipe in the opposite direction of mass movement by all 20 masses being accelerated at 5 m/s/s before the first mass enters the first turnaround.
Q3: what is the total force applied to the pipe by the 20 free floating masses.
Q4: how much force is required to accelerate 42 100kg
masses at 5m/s/s for a distance of 500 ft.

3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.