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

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.

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