Problem a rock is dropped from a tree of height 21 m into a, Ask an Expert

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Problem: A rock is dropped from a tree of height 21 m into a lake (depth 5.2 m) below. After entering the water, the rock floats gently down through the water at a constant speed of 1.2 m/s to the bottom of the lake.

Part I: What is the total elapsed time?

Please show me how work it out above problem.

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