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Homework Help: Projectile Motion - one question.

  1. Feb 7, 2008 #1
    1. The problem statement, all variables and given/known data

    A circus performer wants to land in a net of 5m to the right of where she willlt go of the trapeze. IF she is 10m above the net, how fast must she be moving horizontally when she lets it go?

    2. Relevant equations
    I know we are trying to solve for speed and we are giving distance

    3. The attempt at a solution

    No idea
  2. jcsd
  3. Feb 7, 2008 #2


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    two-step process:
    how long does it take for her to fall 10m?
    how far can she travel in that time horizontally (given a certain initial speed)?
  4. Feb 7, 2008 #3
    id guess use 9.8
  5. Feb 7, 2008 #4


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    write down the relevant equations, and you are good to go
  6. Feb 7, 2008 #5
    i dont know them

    whatr re thy
  7. Feb 7, 2008 #6
    First you must calculate the time it takes for her to travel the 10m down vertically.
    Once you know that time, that is also the time that she has to travel 5m horizontally.
    So you can calculate her horizontal speed necessary by dividing the distance (5m) by the time.
  8. Feb 7, 2008 #7
    t = (2y/g) where y = distance
    so, t= ((2)(10)/-9.8) ~= 2.04 s
    5/2.04 = your answer.

    I could be wrong =)...hopefully not!
  9. Feb 7, 2008 #8
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