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 [g = 10m/s²] - VgyanHub

Question:

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 [g = 10m/s²]

Options :

(a) 9 m/s
(b) 12 m/s
(c) 16 m/s
(d) 21..33 m/s

Answer :

(c) 16 m/s

Answer Steps :

step 1

step 1

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