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[" 3.A ball is dropped from a height of ...

[" 3.A ball is dropped from a height of "20m" 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 "],[12.8m" above the water surface,the fish sees the speed "],[" of ball as (Take "g=10m/s^(2)):],[[" (a) "9m/s," (b) "12m/s," (c) "16m/s," (d) "21.33m/s]]

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

A ball is dropped from a height of 20m 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 12.8m above the water surface, the fish sees the speed of ball as (g=10m//sec^2)

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 the ball as [Take _(g)=10m/s^(2).]

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 the ball as [Take _(g)=10m/s^(2).]

A ball is dropped from a height of 20m. it rebounds to a height on 10m. Calculate the loss of energy of the ball

A fruit which is at 20 m above a lake suddenly detaches from the tree.A fish inside the lake , in the line of fall of fruit,is looking at fruit when fruit is at 12.8 m above the water surface.Speed of fruit as observed by fish (μ_(water)=4/3 and g=10m/s^2)