Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Are Velma and Mort in relative motion?
A) No, because they both have the same speed.
B) No, because they both have the same velocity.
C) No, because neither Mort nor Velma is accelerated.
D) Yes, because they have different velocities.
E) Yes, because they have different speeds.

Question

Quizplus · Accepted Answer

Relative motion is determined by the difference in velocities, not speeds. Velma and Mort have the same speed but opposite directions, resulting in different velocities, hence they are in relative motion.

Velma Bicycles Northward at an Unchanging Speed of 4 M/s