A lead ball is dropped into a lake from a diving board $4\mathrm{.}60$ m

above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom $4\mathrm{.}40$ s

after it is released.

Part A

How deep is the lake?

Express your answer with the appropriate units.

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