Concept explainers
Animal Athletes
Different animals have very different capacities for running. A horse can maintain a top speed of 20 m/s for a long distance but has a maximum acceleration of only 6.0 m/s2, half what a good human sprinter can achieve with a block to push against. Greyhounds, dogs especially bred for feats of running, have a top speed of 17 m /s, but their acceleration is much greater than that of the horse. Greyhounds are particularly adept at turning corners at a run.
Figure 1.1
A greyhound on a racetrack turns a corner at a constant speed of 15 m/s with an acceleration of 7.1 m/s2. What is the radius of the turn?
A. 40 m
B. 30 m
C. 20 m
D. 10 m
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