A 100 gram bullet is fired from a rifle having a barrel 0.8 meter long. Assuming the origin is located where the bullet begins to move, the force (in Newton's) exerted on the bullet by the expanding gas in the positive x direction, with magnitude15000+10000x-25000x2 where x is in meters. Find what work is done by the gas on the bullet, as the bullet travels the length of the barrel?