These situations exhibit the motions that are graphed in Figures 2-10 through 2-12. In (a), the hand gives the car an initial velocity downhill. The net force on the car is uphill. In (b), the initial velocity is uphill, the net force downhill.

Figure 2-13 These situations exhibit the motions that are graphed in Figures 2-10 through 2-12. In (a), the hand gives the car an initial velocity downhill. The net force on the car is uphill. In (b), the initial velocity is uphill, the net force downhill.