A pair of toy cart wheels are rolled obliquely from a smooth surface onto two plots of gra...

A pair of toy cart wheels are rolled obliquely from a smooth surface onto two plots of grass, a rectangular plot and a triangular plot, as shown below. The ground is on a slight incline so that after slowing down in the grass, the wheels speed up again when they emerge on the smooth surface. Finish each sketch by showing some positions of the wheels inside the plots and on the other sides, thereby indicating the direction of travel.