Hilary weighs 113 lbs and carries a bookbag of approximately equal weight. A minute ago, Hilary and her bookbag were at rest.
If Hilary sprints straight to the 10th floor stairwell at a rate of 50 ft / sec, what is the force of Hilary's head-on collision with the stairwell door?
Notes: F = M/A
The stairwell is at rest
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