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A woman is reported to have fallen 144 ft from the 17th
floor of a building, landing on a metal ventilator box,
which she crushed to a depth of 18.0 in. She suffered only
minor injuries. Neglecting air resistance, calculate (a) the
speed of the woman just before she collided with the venti-
lator, (b) her average acceleration while in contact with
the box, and (c) the time it took to crush the box.

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