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Question

A car is fitted with a convex side – view mirror of local length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is:

A
110 m/s
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B
115 m/s
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C
10 m/s
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D
15 m/s
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Solution

The correct option is B 115 m/s
Differentiating the mirror equation and finding the velocity of image. which comes out to be -115. The negative sign just shows the direction of velocity of image.

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