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Homework Help: Projectile motion and Vo

  1. Oct 7, 2008 #1
    1. The problem statement, all variables and given/known data
    An object was lauch at uknow velocity at an angle of 70 degree in the X direction. After 4 second later it land. The distance was 800 meter. Find the Vo of the object. What Vo is compose of?

    2. Relevant equations
    t= 4 sec
    distance travel= 800
    angle= 70

    3. The attempt at a solution
    x= Vocos(u)T and T= 2VoSin/g
    X/(cos(u)*t)= Vo

    the twon Vo did not match is there any other way to find the solution
  2. jcsd
  3. Oct 7, 2008 #2


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    Homework Helper

    With the information given the x/(t*Coos70) = Vo is the only one to be trusted, because the g of the top equation may not be on earth.
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