anonymous
  • anonymous
A ball is thrown from a height of 140 feet with an initial downward velocity of 8/fts . The ball's height h (in feet) after t seconds is given by the following. =h−140−8t16t2 How long after the ball is thrown does it hit the ground?
Mathematics
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anonymous
  • anonymous
A ball is thrown from a height of 140 feet with an initial downward velocity of 8/fts . The ball's height h (in feet) after t seconds is given by the following. =h−140−8t16t2 How long after the ball is thrown does it hit the ground?
Mathematics
schrodinger
  • schrodinger
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freckles
  • freckles
for it to hit the ground the height must be zero
freckles
  • freckles
I don't understand your function
freckles
  • freckles
but pretend we have the height is h h(t)=5t^2+t and we want to know when h is 0 replace h(t) with 0 0=5t^2+t and solve for t

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anonymous
  • anonymous
t=0,-1/5 @freckles
freckles
  • freckles
that is correct for the example function I gave
Ac3
  • Ac3
can't be 0 doesn't make sense
freckles
  • freckles
but as I said I do not understand what your function is
anonymous
  • anonymous
its for a class i didnt write it a teacher did
Ac3
  • Ac3
write it out using the equation thing
freckles
  • freckles
she really wrote "=h−140−8t16t2 " because this makes no sense
anonymous
  • anonymous
h=140-8t-16t^2
Ac3
  • Ac3
ohhhh
freckles
  • freckles
ok replace h with 0
freckles
  • freckles
since we are given the height is 0
freckles
  • freckles
and you are looking for the second 0 not the first 0
Ac3
  • Ac3
then solve for t using factoring or quadratic formula
anonymous
  • anonymous
A ball is thrown from a height of 140 feet with an initial downward velocity of 8/fts . The ball's height h (in feet) after t seconds is given by the following.
freckles
  • freckles
I think your copying and pasting is not working :p
freckles
  • freckles
but anyways you already corrected your function for h so we know it now can you replace h with 0 and solve for t?
anonymous
  • anonymous
ok thnaks =)
anonymous
  • anonymous
t=2.72 or t=-3.22
freckles
  • freckles
those are approximately right and you should be looking for the second zero that zero being t=2.72 (since this occur later)

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