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Work Power Engergy Thrown Toilet Roll Problem

  1. Jan 9, 2012 #1
    1. The problem statement, all variables and given/known data
    A pure silver Lions fan throws a roll of toilet paper at 11.0 m/s from her seat at Ford's Field during a recent game. How fast is the 0.4 kg roll going when it strikes an opposition player 17.0 m below?

    2. Relevant equations
    1/2mv^2 = mgh <-- i think.

    3. The attempt at a solution
    I did 1/2mv^2 = mgh and got something like 18.25 and then got totally confused and did not know how to do it. Please help. I am totally lost. thanks please answer in the next 20 mintues and you will recieve lots of love. Thanks.
     
  2. jcsd
  3. Jan 9, 2012 #2

    Delphi51

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    Yes, definitely an energy question! But I think you have oversimplified a bit. Wouldn't it be
    Initial KE + initial PE = final KE
     
  4. Jan 9, 2012 #3
    I did:
    mgh+1/2mv^2
    and got an answer and I don't know what to do from there.
     
  5. Jan 9, 2012 #4

    Delphi51

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    Initial KE + initial PE = final KE
    mgh+1/2mv^2 = 1/2mV^2
    Fill in the numbers.
     
  6. Jan 10, 2012 #5
    Which direction are they throwing the roll in?
     
  7. Jan 10, 2012 #6

    Delphi51

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    We can find the magnitude of the velocity from the final KE. But not the direction because the initial direction isn't given.
     
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