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

[user2]

Homework Statement

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

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.

 

[Andrew Mason]

Homework Statement

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

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.

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

AM