17. A 5.6 kg toy race car moves along an x axis. The diagram below shows the force acting on the car. (The vertical axis is marked in increments of 2 N.)

a) What is the momentum of the car at t = 9.0 s

b) What is the car's velocity at t = 9.0 s?

The graph has the following coordinates:
time force
sec newtons
1 2
2 4
3 4
4 4
5 2
6 0
7 -2
8 -2
9 0

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