25 A ball is dropped from a height of 20 m above the surface

Last updated: 6/4/2023

25 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 1 9 m s 2 12 m s 3 16 m s 4 21 33 m s