Question

A man runs towards a stationary mirror at a speed 15 m/s. The speed of the image relative to the man is

• A. 15 $m{s}^{-1}$
• B. 30 $m{s}^{-1}$
• C. 35 $m{s}^{-1}$
• D. 20 $m{s}^{-1}$

Answer 1

The correct option is B 30 $m{s}^{-1}$

Given that speed of the man is 15 m/s
The image in the plane mirror runs as fast as the man when viewed by a third person.
As the image and the man run in opposite directions, speed gets add up.
But speed with respect to man is $15-(-15)=30m/s$