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anonymous

  • one year ago

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?

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  1. freckles
    • one year ago
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    for it to hit the ground the height must be zero

  2. freckles
    • one year ago
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    I don't understand your function

  3. freckles
    • one year ago
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    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

  4. anonymous
    • one year ago
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    t=0,-1/5 @freckles

  5. freckles
    • one year ago
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    that is correct for the example function I gave

  6. Ac3
    • one year ago
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    can't be 0 doesn't make sense

  7. freckles
    • one year ago
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    but as I said I do not understand what your function is

  8. anonymous
    • one year ago
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    its for a class i didnt write it a teacher did

  9. Ac3
    • one year ago
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    write it out using the equation thing

  10. freckles
    • one year ago
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    she really wrote "=h−140−8t16t2 " because this makes no sense

  11. anonymous
    • one year ago
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    h=140-8t-16t^2

  12. Ac3
    • one year ago
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    ohhhh

  13. freckles
    • one year ago
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    ok replace h with 0

  14. freckles
    • one year ago
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    since we are given the height is 0

  15. freckles
    • one year ago
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    and you are looking for the second 0 not the first 0

  16. Ac3
    • one year ago
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    then solve for t using factoring or quadratic formula

  17. anonymous
    • one year ago
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    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.

  18. freckles
    • one year ago
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    I think your copying and pasting is not working :p

  19. freckles
    • one year ago
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    but anyways you already corrected your function for h so we know it now can you replace h with 0 and solve for t?

  20. anonymous
    • one year ago
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    ok thnaks =)

  21. anonymous
    • one year ago
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    t=2.72 or t=-3.22

  22. freckles
    • one year ago
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    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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