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Homework Help: Canon Problem - Kinematics

  1. Apr 14, 2005 #1
    Ok, I am having a hard time understanding how to approach this problem the correct way interms of physics.

    A cannon shoots a ball going a total distance of 79.5 meters, clearing a wall 67.5 meters away from where it was initially shot. The wall is 17.58 meters high, what is the allowable launch angle and velocity? Assume gravity is 9.81 meters per second squared.
  2. jcsd
  3. Apr 14, 2005 #2

    draw the projectile
    list all the equations of a projectile
    try to calculate the maximum heigt
    try to find range
  4. Apr 14, 2005 #3


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    Science Advisor

    Write down the formulas for distance and height of a projectile depending on angle and initial speed. You know that the range (distance until the height is 0 again) is 79.5 and that the height 67.5 meters away is at least 17.58 meters. That gives you two equations for angle and speed.
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