JEE Main 2022 Physics question
When a ball is dropped into a lake from a height 4.9 m above the water level, it hits the water with a velocity v and then sinks to the bottom with the constant velocity v. It reaches the bottom of the lake 4.0 s after it is dropped. The approximate depth of the lake is :
Answer: (2)
Solution
The time to fall through 4.9 m is 4.9/9.8) = 1 s, and the speed on reaching the water
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