# physics

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a tennis ball is dropped from 1.30 meters above the ground. it rebounds to a height of 1.00 meters. How do I find with what velocity does the ball hit the ground. With what velocity does it leave the ground, and if the tennis ball were in contact with the ground for 0.01 seconds and how to find its acceleration while touching the ground. How does this compare to gravity?

• physics -

hitting the ground?
v^2=2g*1.3
v needed to get to 1 meter?
v^2=2g*1
At the ground,
Forceground*time=mass(Vgoingup+Vgoingdown)
but Force here is Mass/acceleration, so you can find acceleration while touching the ground.

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