Stopping distances The table lists the practical stopping distances D (in feet) for cars at speeds S (in miles per hour) on level surfaces, as used by the American Association of State Highway and Transportation Officials.
S
20
30
40
50
60
70
D
33
86
167
278
414
593
(a) Plot the data.
(b) Determine whether stopping distance is a linear function of speed.
(c) Discuss the practical implications of these data for safely driving a car.
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