anonymous
  • anonymous
EXAMS NEXT WEEK! Help with Review! Giving Points! The height of a javelin in feet is modeled by h(t)=-16t^2+79t+5, where t is the time in seconds after the javelin is thrown. Determine the maximum height of the javelin. After how many seconds does the javelin reach its maximum height? How many seconds does it take for the javelin to hit the ground? 1. Determine the maximum height of the javelin. 2. After how many seconds does the javelin reach its maximum height? 3. How many seconds does it take for the javelin to hit the ground?
Mathematics
schrodinger
  • schrodinger
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sweetburger
  • sweetburger
rip english
sweetburger
  • sweetburger
im rewriting that
anonymous
  • anonymous
thats what i did and i got 79/32 or 2.46875

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sweetburger
  • sweetburger
ok to find the x value in which you have your maximum y value use the equation -b/2a in which we pull the terms from the form of ax^2+bx+c
sweetburger
  • sweetburger
ok so you found 2.46 for your x value?
sweetburger
  • sweetburger
considering your x value is actually time i think at your maximum height would be the x value in which you found your maximum height. I seriously doubt they want us to use kinematics equations.
sweetburger
  • sweetburger
i think at your maximum height would be the x value in which you find the time it took to reach maximum height.
anonymous
  • anonymous
so what your saying is that 2.47 is my maximum height? if so then what would be the time?
sweetburger
  • sweetburger
yes i believe so

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