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anonymous

  • 5 years ago

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

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  1. anonymous
    • 5 years ago
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    okay what is the height of the bottom of the cliff?

  2. anonymous
    • 5 years ago
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    lets go over this together.

  3. anonymous
    • 5 years ago
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    probably 64!

  4. anonymous
    • 5 years ago
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    try again.

  5. anonymous
    • 5 years ago
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    haha :O ok ya lets go over it.

  6. anonymous
    • 5 years ago
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    you can almost see that 2 squared is 4, and 4 * 16 = 64

  7. anonymous
    • 5 years ago
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    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?

  8. anonymous
    • 5 years ago
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    the cliff is 64 ft. right? lol cuz u said whats the height of the bottom of the cliff i think

  9. anonymous
    • 5 years ago
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    yes, I know what I asked. So, answer me, what do you think the height of the bottom of the cliff is?

  10. anonymous
    • 5 years ago
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    64!

  11. anonymous
    • 5 years ago
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    if I am 6 feet high, how high is the bottom of my feet from the ground?

  12. anonymous
    • 5 years ago
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    ok uhmm blonde moment rite now how bout 16?

  13. anonymous
    • 5 years ago
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    0

  14. anonymous
    • 5 years ago
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    YEAAH

  15. anonymous
    • 5 years ago
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    haha wow blonde moment

  16. anonymous
    • 5 years ago
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    throw h=0 in and solve for t!

  17. anonymous
    • 5 years ago
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    Yes!. so the moment the coin touches the bottom of the cliff, it is 0 feet high from the ground.

  18. anonymous
    • 5 years ago
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    rite.

  19. anonymous
    • 5 years ago
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    craig is trying to rush through it lol

  20. anonymous
    • 5 years ago
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    so equate h to 0 and solve the equation, that is, 0 = -16t^2+64

  21. anonymous
    • 5 years ago
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    ah! ok one moment keep typing watever ur typing.

  22. anonymous
    • 5 years ago
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    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.

  23. anonymous
    • 5 years ago
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    OH!!!! ok ok

  24. anonymous
    • 5 years ago
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    that makes sense! (: thx!! xD

  25. anonymous
    • 5 years ago
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    okay great! you are welcome.

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