2-9.  For each of the following straight-line motions, show the positions on a real number line and sketch the displacement, showing both its direction and its value. Assume east is the positive direction in each case and that the origin is at the stoplight.

a.   A car starts out 250 m east of the light and ends up 350 m east of the light. b.   A bicyclist starts out 250 m west of the light and ends up 350 m east of the light. c.   A delivery truck starts out 250 m east of the light and ends up 350 m west of the light. d.   A pedestrian starts out 250 m west of the light and ends up 350 m west of the light.

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