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Homework Help: Projectile gun question

  1. Oct 8, 2011 #1
    1. The problem statement, all variables and given/known data
    A gun fires a shell with a speed of 315m/s. Neglecting the effects of air resistance, calculate the maximum range of this gun


    2. Relevant equations

    t=(vf-vi)/a
    v=d/t

    3. The attempt at a solution
    it doesn't give me an angle so I am kind of confused on how to solve this problem. I know that to solve this question, i need to figure out the angle the shell is fired at, then use the given velocity to find the x and y component velocities, find time using velocity and acceleration (the first equation), and then use that time to find the range of the gun by solving for d in the second equation. I don't think i have enough information?
     
  2. jcsd
  3. Oct 8, 2011 #2

    gneill

    User Avatar

    Staff: Mentor

    You either:
    1. Happen to have memorized the angle that gives a projectile its maximum range when fired over level ground;
    2. Look up the optimal angle in your text or via the web.
    3. Derive the formula for maximal angle from scratch.

    Some options require more effort... :smile:
     
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