Question

A plane mirror and an object approach each other with speeds of 2 m/s & 7 m/s then
find the speed of the image

1) 4 m/s
2) 7 m/s
3) 11 m/s
4) 9 m/s​

Answer 1

The speed of the image is 11 m/s and the direction is towards left.

Explanation:

Given data:

• Speed of plane mirror = 2 m/s
• Speed of the object = 7 m/s

Vi − Vm = Vm − V0

Vi − (−2) = (−2) − 7

Vi + 2 = - 9

Vi = − 9 - 2 m/s

Vi = - 11 m/s

Hence the speed of the image is 11 m/s and the direction is towards left.

Also learn more

An object moves with 5 m/s towards right while mirror moves with 1 m/s towards the left as shown. Find velocity of image. ?

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