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anonymous

  • 5 years ago

If a stone is tossed from the top of a 190 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 190, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth’s place; include units in your answer.

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  1. radar
    • 5 years ago
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    geekgirl1988, please review the previous question you asked regarding the application of the discriminant. I made an error which I corrected.

  2. anonymous
    • 5 years ago
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    -9.8t^2 - 10t + 190 = 190 t(-9.8t-10) = 0 t=-10/9.8 Thus it will fall after 10/9.8 secs

  3. anonymous
    • 5 years ago
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    yes i saw that radar and it is one solution.

  4. anonymous
    • 5 years ago
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    I think i did a mistake...sorry!

  5. anonymous
    • 5 years ago
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    ok

  6. anonymous
    • 5 years ago
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    The equation you need to solve is -9.8t^2 - 10t + 190 = 0

  7. anonymous
    • 5 years ago
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    would i use the quadratic formula?

  8. anonymous
    • 5 years ago
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    yes

  9. anonymous
    • 5 years ago
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    ok on while i solve the problem.

  10. anonymous
    • 5 years ago
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    you know the formula right

  11. anonymous
    • 5 years ago
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    yes. doing th problem right now. almost done. hold on.

  12. anonymous
    • 5 years ago
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    After you do it, just tell me how old are you? So that I can help accordingly, or else i might miss something you may not know

  13. anonymous
    • 5 years ago
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    i got x=-3.6 or x=2.6 for my answer. and i am 22.

  14. anonymous
    • 5 years ago
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    Right, now the point is can time be negative?

  15. anonymous
    • 5 years ago
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    would that answer be no. if so then the answer to the problem would be 2.6 seconds per meter so it would be 494 seconds. or am i wrong.

  16. anonymous
    • 5 years ago
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    Yup you are right, btw how did you get that value 494?

  17. anonymous
    • 5 years ago
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    2.6*190=494. should i not put that into the answer.

  18. anonymous
    • 5 years ago
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    Nope, that doesn't mean anything!

  19. anonymous
    • 5 years ago
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    The last part would be 2.667

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