anonymous
  • anonymous
A boy standing on a 64 foot cliff drops a coin off the cliff. If the equation of the height h of the coin t seconds after it drops is h = -16t2 + 64, about how many seconds will the coin take to reach the bottom of the cliff? A. 1 second B. 1.5 seconds C. 2 seconds D. 2.5 seconds
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
okay what is the height of the bottom of the cliff?
anonymous
  • anonymous
lets go over this together.
anonymous
  • anonymous
probably 64!

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More answers

anonymous
  • anonymous
try again.
anonymous
  • anonymous
haha :O ok ya lets go over it.
anonymous
  • anonymous
you can almost see that 2 squared is 4, and 4 * 16 = 64
anonymous
  • anonymous
the equation states that h is the height of the coin t seconds after it is dropped. You are asked to find when it reaches the bottom. So what is the height of the bottom?
anonymous
  • anonymous
the cliff is 64 ft. right? lol cuz u said whats the height of the bottom of the cliff i think
anonymous
  • anonymous
yes, I know what I asked. So, answer me, what do you think the height of the bottom of the cliff is?
anonymous
  • anonymous
64!
anonymous
  • anonymous
if I am 6 feet high, how high is the bottom of my feet from the ground?
anonymous
  • anonymous
ok uhmm blonde moment rite now how bout 16?
anonymous
  • anonymous
0
anonymous
  • anonymous
YEAAH
anonymous
  • anonymous
haha wow blonde moment
anonymous
  • anonymous
throw h=0 in and solve for t!
anonymous
  • anonymous
Yes!. so the moment the coin touches the bottom of the cliff, it is 0 feet high from the ground.
anonymous
  • anonymous
rite.
anonymous
  • anonymous
craig is trying to rush through it lol
anonymous
  • anonymous
so equate h to 0 and solve the equation, that is, 0 = -16t^2+64
anonymous
  • anonymous
ah! ok one moment keep typing watever ur typing.
anonymous
  • anonymous
or, 16 t^2 = 64. or t^2 = 4 or t = +2 or -2. Since time cannot be negative, t = +2. So it takes 2 seconds to reach the bottom.
anonymous
  • anonymous
OH!!!! ok ok
anonymous
  • anonymous
that makes sense! (: thx!! xD
anonymous
  • anonymous
okay great! you are welcome.

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