Question

a man is running towards a plane mirror at a speed of 10 m/s how fast does he see himself running towards his image?​

Answer 1

Required Answer:-

As the man is approaching the mirror, his image will also approach the mirror with the same speed but in the opposite direction.

Taking the direction of speed of the object as positive, the speed of the image will be negative.

So,

• Speed of the object = 10 m/s
• Speed of the image = -10 m/s

When the man sees himself running towards his image, the velocity is the relative velocity between the object and the image$.$

Thus,

Relative velocity = Vo - Vi

= 10 - (-10) m/s

= 20 m/s

Speed of the man w.r.t to the image is 20 m/s.

Answer 2

Answer:

20 m/s

Explanation:

Given :-

a man is running towards a plane mirror at a speed of 10 m/s

To Find :-

how fast does he see himself running towards his image?

Solution :-

Since, His speed is 10 m/s. So, his image will also with same speed but in opposite direction. The speed of image will be -10 m/s. This is because the man is coming forward to his image and his image will be also coming with same speed and in backward direction. So,

Time taken to see his image = 10 - (-10)

=> 10 + 10

=> 20 m/s