Question

A person is approaching a plane mirror with speed 10 cm/s. If the initial distance between person and mirror is 1 m, then the distance between person and his image after 2.5 sec will be

Answer 1

Answer:

Let the distance between the mirror and me be x.

So distance between the me and image is 2x.

Time is same for both.

So ratio of speed of mirror to the speed of image is :

V1/V2 = x/t /2x/t

10/V2 = 1/2

V2 = 10×2

V2 = 20 cm/s

Hence the speed of the image is 20 cm/s