Question

When a plane mirror moves towards a stationary object with velocity u,then the image will move with speed 2u in the same direction as that of mirror. Why??

Answer 1

 Well His image or reflection will appear to move toward him at twice the speed than he is going. He walks towards the mirror at 4 miles per hour than his reflection will move toward him in his perspective at 8 miles per hour. The same thing when 2 people walk towards each other at that same speed