Question

82.
A boy is standing at 20 m away from a plane mirror. He starts running
towards the mirror with the speed of 5 m/s. The image of the boy appears to
be running towards him with the speed of
(a) 4 m/s
(b) 10 m/s
(c) 2.5 m/s
(d) 100 m/s​

Answer 1

Answer:

A.........4m/s is the answer

Answer 2

It will be

B) 10 m/s

as we know that 1 m in front of the plane mirror would seem like 2m.

so, here

now , boy is going towards mirror therefore direction will be -ve

and as the image is coming infront of the mirror the boy but from the other side  

5m/s - (-5m/s)

5 + 5 m/s

= 10m/s

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