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A child on a bridge throws a rock straight down to the water below. The point
where the child released the rock is 94 m above the water and it took 1.2 s for
the rock to reach the water. Determine the rock's velocity (magnitude &
direction) at the moment the child released it. Also determine the rock's
velocity (magnitude & direction) at the moment it reached the water. Ignore air
drag.

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