An athlete runs around a 400 meter track in 60 seconds, starting and finishing at the same place. What is her speed and velocity in m/s?

Loading ...

Correct Answer: **A.** *Speed = 6.67 m/s and Velocity = zero*

Speed is a scalar quantity involving magnitude only: Speed = distance/time = 400/60 = 6.67 m/s. Velocity is a vector quantity involving both magnitude and direction: Velocity = displacement/time = 0/60 = zero.

Distance traveled is not dependent on a direction, but displacement is. Displacement = distance from the finish to the start, which in this case is zero as the athlete has run around an oval to arrive back at her starting place.

Get it right? Tweet at us:

**Subscribe below** to receive the MCAT Question of the Day delivered straight to your inbox every morning.