strange gravity on vehicle

so I have a small vehicle. when it hits a bump on the road it flips on its back and for some reason i can then drive it into the sky.
I have accelerate behaviour on the vehicle for gravity?
I have added a pic but couldn't get a screen capture of it in the air however it goes straight up when I push the forward button but falls when I let go

It is just a test game for practicing so don't laugh.

http://imageshack.us/photo/my-images/580/screenshot20130419at213.png/

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