A boy walks away from a plane mirror at a speed of 3 ms -1
PHYSICS
WAEC 1996
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
Correct Answer: 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.
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