kinetic energy of a projectile (velocity and time are not given)

1. The problem statement, all variables and given/known data

Hi!

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.