Antiaircraft gun force physics problem

[zcabral]

Homework Statement

The largest-caliber antiaircraft gun operated by the German air force during World War II was the 12.8 cm Flak 40. Suppose this weapon fired a 24.4 kg shell with a muzzle speed of 910 m/s. What propulsive force was necessary to attain the muzzle speed within the 6.00 m barrel? (Assume the shell moves horizontally with constant acceleration and neglect friction.)

Homework Equations

F=ma

The Attempt at a Solution

I know the force will be obtained by multiplying 24.4 by acceleration, however i can't determine acceleration.
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[G01]

What do you know about the motion of the bullet? Initial/Final Speeds? Over what distance is it accelerating? HINT: Go back to kinematics.

 

[chrsr34]

Look at your constant acceleration equations

Chris