The Explosion in a Cannon Exerts an Average Force of 30,000

The explosion in a cannon exerts an average force of 30,000 N for L meters,the length of the cannon.The length of the cannon to shoot a 2.00 kg projectile from the cannon on the earth to the moon is

A) 2.75 km.
B) 3.01 km.
C) 3.98 km.
D) 4.26 km.
E) 5.02 km.