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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 6.3-kg projectile from rest to a speed of 3.0 x 10^3 m/s. The net force accelerating the projectile is 7.1 x 10^5 N. How much time is required for the projectile to come up to speed?

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