A rock is dropped straight off a bridge that is 9 meters above the ground and falls at aconstant speed of 10 m/sec. Another person is 12 meters away...
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A rock is dropped straight off a bridge that is 9 meters above the ground and

falls at a constant speed of 10 m/sec. Another person is 12 meters away on the same bridge. At what rate is the distance between the rock and the second person increasing just as the rock hits the ground?

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