Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    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


    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:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook