Physics Cont'd  Quidditch
posted by Anonymous .
For time t = d/v
140/20
t= 7
0 = 1/2(10)(7^2)+(15)(7)+h
h = 140
h = 140
We were asked to use 10m/s^2 for acceleration. That's what I got.

You got it!
Using 10m/(s^2) for gravity, 140m is correct.
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