You are running on a circular track. At some time during your run, a friend of y

Question

You are running on a circular track. At some time during your run, a friend of yours starts a stopwatch. At the time t = 39.2 s on the stopwatch you have just completed one lap around the track, which has a radius of 20.0 m. Let the positive-x direction point westward, (a) What total distance did you run during the time t? (See the inside cover of the Problems Lab Activity book for geometry equations if needed!) (b) What was your average speed during the one lap? (c) What was your average x-component of velocity?

Explanation / Answer

a) total distance run during the time = 2pi R = 2x3.14x20 = 125.6 m

b) average speed during the one lap = 125.6/39.2 = 3.20 m/s

c) the average x component of velocity is zero

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