1. The problem statement, all variables and given/known data A 3000kg cannon fires a 14 kg shell horizontally with a muzzle velocity of 450m/s. The cannon recoils for a distance of 2.5m before coming to a stop. What is the coefficient of friction between the cannon and the ground that it rests upon? mcannon= 3000kg mball=14kg v1ball=0 v2ball=450m/s v1cannon = 0 v2cannon= ? I dont really know where to begin with this question.. Is it a momentum/impulse question or something else? Please help..