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OpenStudy (anonymous):
A firecracker shoots up from a hill 140 feet high, with an initial speed of 100 feet per second. Using the formula H(t) = -16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?
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OpenStudy (anonymous):
H = 0 You're given v and s. Solve the quadratic equation for t.
OpenStudy (anonymous):
the answer choices are 5 seconds 7 seconds 9 seconds 11 seconds
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