Solving problem very important

[elyes]

please help me to solve this problem thank you
the largest-caliber antiaircraft gun operated by the german air force during wold was the 12-8-cm flak 40 .this weapon fired a 25.8-kg shell with a muzzle speed of 880 m/s. what propulsive force was necessary to attain the muzzle speed within the 6.00m barrel ? ( assume the sheel moves horizantally with constant acceleration and neglect friction)

 

[learningphysics]

Find the acceleration using kinematics... then get the force using F = ma.