A car is fitted with a convex side-view ...

A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8m 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 mrror of the first one is:

`1/15` m/s

10 m/s

15 m/s

`1/10` m/s

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