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Statement of a problem № 3066

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A ball is dropped into a lake from a diving board 4.9 m above the water. It hits the water with velocity v and then sinks to the bottom with the constant velocity v. It reaches the bottom of the lake 5.0 s after it is dropped. Find (a) the average velocity of the ball and (b) the depth of the lake.

Solution:
A ball is dropped into a lake from a diving board 4.9 m above the water. It hits

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