Ignoring air resistance, that would be about 145 feet.
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If the rock falls at 96 feet per second then multiply that by two to find out how far the rock traveled in two seconds which is 192 feet. Subtract 192 from 640 and the answer is 448. Therefore, the rock is 448 feet high after two seconds.
45
It depends how densely it is distributed.
29.4
Volume = (84) x (1/6) = 14 cubic feet = 0.52 cubic yard