A boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror. At what speed is his image approaching him?

A. 89.0ms-1
B. 6.0ms-1
C. 4.5ms-1
D. 1.5ms-1
E. 0.0ms-1

Correct Answer:

Option B – 6.0ms-1

Explanation

Velocity of image w.r.t boy = velocity of object – velocity of image

velocity w.r.t to boy = v – (-v)

=3.0 – (-3.0)

The image velocity is 6 m/s towards the boy.