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Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from to m in 30 seconds. What is the speed of the object in km per hour ?
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| Question Text | Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from to m in 30 seconds. What is the speed of the object in km per hour ? |
