Posted by **bee-z** on Sunday, October 7, 2012 at 2:55am.

A rock is dropped from a tree of height 25 m into a lake

(depth 5.0 m) below. After entering the water, the rock then

fl oats gently down through the water at a speed of 1.5 m/s to

the bottom of the lake. What is the total elapsed time?

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