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OpenStudy (oleg3321):
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 (oleg3321):
Five seconds Seven seconds Nine seconds 11 seconds
OpenStudy (aaronq):
find t when s=-140 ft
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