Stuck on beginning of buggy level (spoilers)

[Lester_Burnham]

Hi, I am stuck at the part when you get in the buggy and she drops you upside down. I can't figure out how to flip the buggy. It's probably really easy but I can't seem to figure it out. Thanks in advance.

 

[fookhar]

Use the gravity gun.

 

[Billieboyboyboy]

Primary fire button.