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Projectile motion - Determination of time taken by body to gain a final velocity and acceleration of the body.

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 the 5.0 kg projectile from rest to a speed of 4.0 x 103 m/s. The net force accelerating the projectile is 4.9 x 105 N. How much time is required for the projectile to come up to speed?

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