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anonymous

  • one year ago

Can someone help me? Will medal and fan! 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? Five seconds Six seconds Seven seconds Eight seconds

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  1. anonymous
    • one year ago
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    Seven Seconds

  2. anonymous
    • one year ago
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    Thank you, but can you also explain it, please?

  3. anonymous
    • one year ago
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    16t^2 - 90t-160 = 0 solving for t: t = 7 secs approx.

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