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 4.0 x 10^3 m/s^2. The net force accelerating the projectile is 4.9 x 10^5 N. How much time is required for the projectile to come up to speed?
Solution. Denote the net force accelerating the projectile by F, denote the acceleration of the projectile by a, ...
The solution shows how to calculate the time needed to accelerate to certain speed by using Newton's second law.