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.
8 9.0ms-1 -
B.
6.0ms-1 -
C.
4.5ms-1 -
D.
1.5ms-1 -
E.
0.0ms-1
Correct Answer: Option B
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.