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IIT JEE Advanced 2009 Paper 1

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Question : 7

Total: 60

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as (Take g = 10 m/s2)

9 m/s
12 m/s
16 m/s
21.33 m/s

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