Mathematics, 23.08.2019 09:00, myriamatm

Afirecracker shoots up from a hill 160 feet high, with an initial speed of 90 feet per second. using the formula h(t) = −16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?
a five seconds
b six seconds
c seven seconds
d eight seconds

Answers: 1

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Afirecracker shoots up from a hill 160 feet high, with an initial speed of 90 feet per second. using the formula h(t) = −16t2 + vt + s, approximately how long will it take the firecracker to hit the ground? a five seconds b six seconds c seven seconds d eight seconds

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Afirecracker shoots up from a hill 160 feet high, with an initial speed of 90 feet per second. using the formula h(t) = −16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?
a five seconds
b six seconds
c seven seconds
d eight seconds