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OpenStudy (ttp):
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? Five seconds Seven seconds Nine seconds 11 seconds
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OpenStudy (samsungfanboy):
I believe it's seven seconds.
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