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Potato Head Offline
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Name: Non'ya
Age: 27
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Join Date: January 6th 2009

My oh my... Help me with Physics! - October 5th 2009, 12:14 AM

My brain feels like it's going to explode!
I'm only going to post one problem and hope to god that any help with that can help me with the other 5 or 6.
I don't understand a thing...

Do not just give me an answer, I need explanations and any equations you use.
From what I can tell I can't use F=MA unless I'm missing something.

4. 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. 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?

Any help is appreciated.

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