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
Verified Correct Answer: B.
Physical Principles & Numerical Solution
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.
Source: Myschool Past Questions Archive (Record #25224)