1. The problem statement, all variables and given/known data A large gun accelerates a 5.0 kg mass from rest to a speed of 4000 m/s into orbit. The net force accelerating the bullet is 490,000 N. How long will it take the projectile to come up to speed? It doesn't say anything above air resistance or gravity. 2. Relevant equations acceleration = net force / mass time = velocity / acceleration 3. The attempt at a solution 0.041 seconds (using the equations listed above) What about gravity? Was this already calculated into the net force?