iPhone wont charge, turn on, or stay on.

So today I dropped my phone when it got knocked out of my hand by someone in school while we were walking down the hallway (on accident.) and now it wont turn on or charge. sometimes though I can get it to turn on but right when I see the apple logo it turns right back off. I cant restore it or anything either, so what can I do?

iPhone 4.

Thank you for your help ahead of time.