A runner in a relay race runs 20 m north, turns around and runs south for 30 m, then turns north again and runs 40 m. The entire run took 30 seconds. Draw a sketch. What was the average speed of the runner?

Question

Savannah Trevino

Physics

23 August, 16:06

A runner in a relay race runs 20 m north, turns around and runs south for 30 m, then turns north again and runs 40 m. The entire run took 30 seconds. Draw a sketch. What was the average speed of the runner?

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Answers (1)

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Esther Quinn · Answer 1

3.33m/s

Explanation:

The total distance that he runs is

30m north + 30m south + 40m north = 100 m

If the entire run takes 30 seconds then the average speed is distance over a unit of time

100 / 30 = 3.33 m/s

You can draw a sketch of a line going north 2 spaces, then going south by 3 spaces, finally going north again by 4 spaces