AP PHYSICS .. please help???

Question

Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 5.0 kg projectile from rest to a speed of 3.8 103 m/s. The net force accelerating the projectile is 4.6 105 N. How much time is required for the projectile to come up to speed?
____ s

Answer 1

You have a mass and a force, so you can compute accleration (a), watch your units!!. Then 3800 = a*t in seconds.