Question

A man runs towards the plane mirror at 2 m/s and plane mirror moves towards the man with 1 m/s. The relative speed of his image w.r.t. ground will be

Answer 1

When mirror is fixed the speed with which the image moves is equal to 2 times the speed with which the object moves .

So here it will be 4m/s .But image is also moving with 1 m/s speed

So actual speed of image would be 5 m/s with respect to object

Hence relative speed of his image with respect to ground will be 5 -1 =4m/s

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