Answer
(a) $average~speed = 1.68~m/s$
(b) The average speed of 1.68 m/s is about 10% faster than the sustained speed of 1.54 m/s after swimming for ten minutes. Perhaps fatigue may account for the difference since the swimmer may start slowing down after swimming for ten minutes.
Work Step by Step
(a) We can find the average speed:
$average~speed = \frac{distance}{time}$
$average~speed = \frac{1500~m}{14~min~53~sec}$
$average~speed = \frac{1500~m}{893~s}$
$average~speed = 1.68~m/s$
(b) The average speed of 1.68 m/s is about 10% faster than the sustained speed of 1.54 m/s after swimming for ten minutes. Perhaps fatigue may account for the difference since the swimmer may start slowing down after swimming for ten minutes.
