Question

A plane mirror is mounted on the back of a truck which is traveling 20m/s. how fast does the image of a man standing in the road behind the truck seem to be moving away from him​

Answer 1

It moves at 40 m/s.

If the man is 10 meters from the truck then his image appears to be

20 meters away. So in a given unit of the time the image will appear to

move twice as far as the truck moves from the man.