Chapter 15.5, Problem 4aTH

A bicycle coasts up a hill while a car drives up the hill at constant speed. The strobe diagram shows their positions at instants 1−4, separated by equal time intervals. The bicycle comes to rest relative to the road at instant 4.

1. As measured in the reference frame of the road:

• Is the acceleration of the bicycle in the positive direction, in the negative direction, or zero? Explain.
• Are the velocity and acceleration of the bicycle in the same or in opposite directions?