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## Homework Statement

NASA operates a 2.2 second drop tower at the Glenn Research Center in Ohio, where experimental packages are dropped from the top of the tower.

a) What is the drop distance of a 2.2 s tower?

b) How fast are the experiments traveling when they hit the airbags at the bottom of the tower?

c) If the experimental package comes to rest over a distance of .75 m upon hitting the airbags, what is the average stopping acceleration?

## The Attempt at a Solution

I'm pretty sure I've got a & b correct, but I'm not sure how to go about solving part c. Can someone help me please?

a) What is the drop distance of a 2.2 s tower?

x = 1/2*gt

^{2}= .5*9.81*2.2

^{2}= 23.74 m

b) How fast are the experiments traveling when they hit the airbags at the bottom of the tower?

v = gt = 9.81 * 2.2 = 21.582 m/s

c) If the experimental package comes to rest over a distance of .75 m upon hitting the airbags, what is the average stopping acceleration?

I think one formula for acceleration is Δv/Δt but I'm not sure how to use that in this case...