The displacement 
r of the car is a vector that points from the initial position of the car at time t
0 to the final position at time t.The magnitude of 
r is the shortest distance between the two positions.
Figure 3.1  The displacement D r of the car is a vector that points from the initial position of the car at time t 0 to the final position at time t.The magnitude of D r is the shortest distance between the two positions.


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