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OpenStudy (anonymous):
A firecracker shoots up from a hill 145 feet high with an initial speed of 80 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):
Hint: The firecracker will hit the ground when its height becomes zero..i.e when −16t2 + vt + s=0 you have speed v and height s...so put in the values and solve of t
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