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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? 5 seconds 7 seconds 9 seconds 11 seconds I have no understanding on these questions. Thank you for your help(:
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