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Avg. acceleration physics help

  1. Jan 15, 2008 #1
    So here is the question I'm stuck on.

    A woman is reported to have fallen 112 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 24 in. She suffered only minor injuries.

    Calculate the magnitude of her average acceleration while in contact with the box.

    I know average accel. = (delta v) / (delta t)

    I calculated the speed of the woman just before she collided with the box to be 84.664 ft/s.

    Although I'm a bit lost on how to calculate the avg. acceleration because I'm not sure what equation I should use to calculate (t).
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 15, 2008 #2

    Doc Al

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    Staff: Mentor

    Try expressing delta t in terms of delta v and the distance.

    (You can also take advantage of kinematic relationships that directly relate speed, distance, and acceleration.)
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