Science Fiction. Nullify gravity launches Coke can makes a bus fly. 1990s-2010. Spoiler.

[Ward]

1990s-2010 era

Spoiler

A young guy figures out how to nullify gravity/mass with like a modified remote control. First time it's turned on it launches a Coke can into the ceiling. Remember him and friends on the run from the government/corporations. They end up making a bus fly and releasing the tech to the world. Almost a John Varley Rolling Thunder vide to the book.