anonymous
  • anonymous
If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? Use the equation h = -16t2 + 64t + 4.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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welshfella
  • welshfella
when the ball hits the ground h will = 0 so form an equation and solve for t
anonymous
  • anonymous
So far I have this 64 +/- sqrt 3840 over 32. But I don't know what to do after that
welshfella
  • welshfella
make it easier by taking out -4 -4(4t^2 - 16t - 1) = 0 now apply quadratic formula to the expression in the parentheses t =[ 16 +- sqrt(256 - 4*4 * -1) ] / 8

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welshfella
  • welshfella
t = (16 + 16.49) / 8 (neglect the negative root)
anonymous
  • anonymous
im confused
welshfella
  • welshfella
haven't you used the quadratic formula before?
anonymous
  • anonymous
yes but I didn't get what you got
welshfella
  • welshfella
i applied it to 4x^2 - 16x - 1 = 0
welshfella
  • welshfella
- smaller numbers
anonymous
  • anonymous
oh ok
welshfella
  • welshfella
i divide through by -4 to make it easier
welshfella
  • welshfella
this equation will have the same roots as the bigger one
anonymous
  • anonymous
so the answer I got was 16+/- sqrt 17 over 2 is that what you got?
welshfella
  • welshfella
(16 + sqrt272 ) / 8 = 4.06 secs
anonymous
  • anonymous
my answer has to be in the quadratic formula
welshfella
  • welshfella
oh ok so that's (16 + sqrt(16*17) ) / 8 = 16 + 4*sqrt17 ----------- 8 = 2 + 0.5 sqrt17
anonymous
  • anonymous
ok thank you
welshfella
  • welshfella
yw

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