Calculating Car Speed for Jumping Railroad Tracks

[IHateYou]

I got a ticket for "jumping railroad tracks," so I have to prove that at the speed I was going, my car wouldn't have got off the ground going over those railroad tracks. I think I'm going to have to find out how fast a car with the mass of my car would have to be going to get air over track of whatever angle the tracks I went over are, but I haven't been in physics class for 6 months, so I'm pretty lost. Someone please explain how I can do this. What formulas and such do I need?

 

[sophiecentaur]

You could always repeat the experiment - when no one was watching.

 

[IHateYou]

I thought about that, but there is usually a cop parked there.