A runner travels \( 1.5 \) laps around a circular track in a time of 50 s. The diameter of the t...

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A runner travels \( 1.5 \) laps around a circular track in a time of 50 s. The diameter of the track is \( 40 \mathrm{~m} \) and its circumference is \( 126 \mathrm{~m} \). Find : (a) the average speed of the runner and (b) the magnitude of the runner's average velocity.
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