anonymous
  • anonymous
If an object is dropped from a height of 144 feet, the function h(t)=-16t2t+144 gives the height of the object after t seconds. When will the object hit the ground? A. 9 s B. 6 s C. 1.5 s D. 3 s
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
what it the position fundtion what is -162t2 ? do you mean \[-16t ^{2}+t\]
anonymous
  • anonymous
anonymous
  • anonymous
ok set it equal to zero and solve for t.

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anonymous
  • anonymous
check it @Mr.Me
anonymous
  • anonymous
-16t^2+144=0 16t^2=-144 t^2=9 ...
anonymous
  • anonymous
so t=+- 3 but -3 doesn't make sense so t=3s is good answer
anonymous
  • anonymous
so is it A or D
anonymous
  • anonymous
d because t^2=9 and t=3
anonymous
  • anonymous
okay thanks

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