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Homework Help: Kinetic energy of a projectile (velocity and time are not given)

  1. Jul 1, 2014 #1
    1. The problem statement, all variables and given/known data
    Task is to calculate kinetic energy of a projectile and cannon recoil velocity.

    known data:
    -mass of antiaircraft cannon: 3t
    -max horizontal distance: 4km
    -mass of a projectile 2kg
    barrels: 2

    3. The attempt at a solution
    Since there is no initial velocity or time or max height given i can't find a way to start this.
  2. jcsd
  3. Jul 1, 2014 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Welcome to PF User2!

    You can find the initial velocity from the maximum range (which is maximum for a launch angle of 45°). See:http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html#tra4

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