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skapat Group Title

Can anyone help me out with this problem: A ball is thrown vertically upward with initial velocity v. Find the maximum height H of the ball as a function of v. Then find the initial velocity v required to achieve a height of H.

  • one year ago
  • one year ago

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  1. Shadowys Group Title
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    we'll just use the eq, \(v^2 = u^2 +2aS\), since u=0, a=-g,(since it is opposite direction of v), rearranging gives \(S=\frac{v^2}{2g}\)

    • one year ago
  2. Shadowys Group Title
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    where S=H

    • one year ago
  3. skapat Group Title
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    ive arrived at this answer too...however when i submitted it...it said that g was not defined in this context

    • one year ago
  4. skapat Group Title
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    is there any way to answer this in terms of H and v only?

    • one year ago
  5. Shadowys Group Title
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    or, you can just sub g=10 into it

    • one year ago
  6. skapat Group Title
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    thats what i would think so too. but it still says that answer is incorrect

    • one year ago
  7. Shadowys Group Title
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    oh oh. sorry. my mistake. it's initial velocity, not end velocity. since v=0, \(u=\sqrt{2gH}=\sqrt{19.8H}\)

    • one year ago
  8. skapat Group Title
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    tried that one too unfortunately....im not sure what they looking for

    • one year ago
  9. Shadowys Group Title
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    dang==then i have no idea what they want

    • one year ago
  10. skapat Group Title
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    thanks for trying to help though. ...its very much appreciated :)

    • one year ago
  11. Shadowys Group Title
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    you're welcome :)

    • one year ago
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