anonymous
  • anonymous
a rock breaks loose from a cliff and plunges toward the ground 400 feet below. The distance "d" that the rock falls in "t" seconds is given by the equation d=16t^2. how long does it take the rock to hit the ground??
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
everybody helppin each other but knowbody want to help me whats up with that
anonymous
  • anonymous
the distance the rock has to travel to hit the ground is 400ft. 400 = 16 * t^2 divide both sides by 16 and take the square root.
anonymous
  • anonymous
25=t^2

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anonymous
  • anonymous
5=t
anonymous
  • anonymous
Yup. Don't forget your units!
anonymous
  • anonymous
5 seconds
anonymous
  • anonymous
yep!

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