anonymous
  • anonymous
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
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Seven Seconds
anonymous
  • anonymous
Thank you, but can you also explain it, please?
anonymous
  • anonymous
16t^2 - 90t-160 = 0 solving for t: t = 7 secs approx.

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