Question

A runner runs the circuit twice with a length of 10 km in 1 hr. and 15 minutes.

a. What is the runner’s average speed?
b. What is the runner’s average velocity?

(the answer should be in m/s)

Answer 1

Answer:

Since the length of the circumference of the circle is (pi)d = 2r (pi),

D = 3.1416 (200) = 628.32 meters

V = distance/time = 628.32 m / 10 seconds = 62.832 meters/second. (quite fast)

Note that running in a circle requires an acceleration to the center but this does not change the magnitude (speed) of the velocity.

Explanation:

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