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Homework Help: Calculate the initial velocity given degree and time

  1. Sep 20, 2010 #1
    1. The problem statement, all variables and given/known data
    haha, so hopefully my last question for the night!
    Find the initial velocity, when the object is shot at 70 degrees and took 6.5s to land. (hint: look at the y direction first this time)
    (For more information regarding my question, visit my earlier question from tonight: https://www.physicsforums.com/showthread.php?p=2890328#post2890328)


    2. Relevant equations
    So, I doubt it will work, but there is the equation I used earlier, Range = v02sin2θ/g



    3. The attempt at a solution
    Now, I know that there is the method of dividing it up into components of x and y, however I did not quite understand that. When calculating the initial velocity, given distance traveled and degree, I used Range = v02sin2θ/g which worked great (refer to https://www.physicsforums.com/showthr...28#post2890328 [Broken] ), however, I don't know if that can apply to this too... Sorry, but physics is really confusing me at the minute

    Let me try the component method... Okay, so, looking at the y component. Y is affected by g. Voy=s*Cos(theta)*t -.5gt^2. (I dunno if that equation is correct). So, than, I don't know s.... stuck.... Sure I did something wrong or I am just not getting something...
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 20, 2010 #2
    *Bump*
    I really need help with this tonight...
     
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