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d=1/2at^2

80=1/2(9.80)t^2

80=4.90t^2

t^2=80/4.90

t=square root 16.33

t=4.04s

v=d/t

v=1330/4.04

v=330 m/s

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Q: A shell is fired with a horizontal velocity in the positive x direction from the top of an 80 meter high cliff and stirkes the ground 1330 meters from the base of the cliff what is its initial speed?
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