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Homework Statement
After falling from rest at a height of 30m, a 0.50 kg ball rebounds upward, reaching a height of 20m. If the contact between ball and ground lasted 2.0 ms, what a average force was exerted on the ball?
Homework Equations
The kinematic equations?
F=ma
w=mg?
I don't really know
The Attempt at a Solution
Sorry I don't even know where to begin. I don't really understand this section in the book so i don't even know what to do. The answer is supposed to come out to 1.1 x 10^4 upward.
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