1. The problem statement, all variables and given/known data A bullet with a mass of 15 grams is fired from a rifle with a barrel that is 85 cm long. a. assuming that the force exerted by the expanding gas to be a constant 7200N, what speed would the bullet reach? 2. Relevant equations Ek= 1/2mv^2 Work= Force x distance 3. The attempt at a solution Originally I thought that 7200 N were equal to Energy Kinetic so I solved like that 7200N=.5(.015)v^2... but that seems to be incorrect. So I found the equation for work So I tried doing work= 7200N x .85 meters work = 6120 J Then setting that equal to Ek so... 6120J= 1/2(.015)v^2 v= 903 m/s But that also seems to be incorrect. Am I missing a step? Or am I using the wrong equation? Please Help me, thank you in advance.