a.)b.) The object is at rest in the time intervals 0 < t < 0.6 sec, 1.4 < t < 2.0 sec and 2.6 < t < 3.0 seconds because in those time intervals the position is not changing.
c.) The velocity is negative in the time interval 0.6 < t < 1.4 seconds because the position is decreasing with time.
The change in velocity for both the bicycle and the car is 5 mph. Since that velocity change is the same for both and occurs in the same time, the car and bicycle have the same acceleration (no matter how long it took for the velocity change to occur).
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Last updated: 8 Sep 1999
Comments: bland@indiana.edu