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Image of an object approaching a convex ...

Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from `(25)/(3) m to (50)/(7)` m in 30 seconds. What is the speed of the object in km per hour?

A

`3 km h^(-1)`

B

`4 km h^(-1)`

C

`5 km h^(-1)`

D

`6 km h^(-1)`

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The correct Answer is:
A
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