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18 October, 13:47

A firecracker 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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Answers (1)
  1. 18 October, 16:48
    0
    The answer is A. All i did was take the 90 and the 16 and divided them.
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