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