A person walks toward a plane mirror at 2.0 ft/s. She is approaching her image in the mirror at a speed of
A)1.0 ft/s.
B)3.0 ft/s.
C)2.0 ft/s.
D)4.0 ft/s.
E)5.0 ft/s.

Question

Quizplus · Accepted Answer

The image in a plane mirror appears to be the same distance behind the mirror as the object is in front. As the person approaches the mirror at 2.0 ft/s, the image also approaches the mirror at 2.0 ft/s, making the relative speed between the person and the image 4.0 ft/s.

A Person Walks Toward a Plane Mirror at 2