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Homework Help: Basic Physics Help

  1. Jul 15, 2007 #1
    Hey guys I need some help, I am struggling in a PH100 class and my professor is not that much help.

    This problem puzzles me and I have been working on it all night.

    "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 4.7 103 m/s. The net force accelerating the projectile is 5.9 105 N. How much time is required for the projectile to come up to speed? "

    We are currently studying force, but I am lost how to find time using newton's laws?

  2. jcsd
  3. Jul 16, 2007 #2


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    Homework Helper

    Here's how you find the time:

    1. Look at your watch.
    2. Fire the gun
    3. Look at your watch again.

    P.S. shouldn't this question be posted in the homework help forums?

    P.P.S. Figure out the acceleration 'a'. Then use v=at to get the time t, since you know the final velocity v.
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