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. A car's speed during the interval t = 0.5 s to t = 20 s is given by t = c√t,
where c is a constant. Over the interval t = 10 s to t = 20 s, is the average
speed greater than, equal to, or less than the instantaneous speed (a) at
t = 15 s and (b) at t = 20 s?
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