It's simple! Get a car that can go the speed of light. Then run it down a hill! 8^)
Actually, it's thought that nothing can go faster than the speed of light. It's kind of strange, no matter how fast you're going, light passes you at the speed of light as if you were standing still.
For sci fi stories where ships visit planetary systems in other galaxies, they had to figure out some way to travel at many times the speed of light. Because otherwise it would take millions of years to get there, and Kirk and Spock and McCoy would be . . .well, they'd be as old as they are now! 8^) But that's why they call it science -fiction-.