Hitting a car hurts! Don't do it. I ploughed into the side of a car at <30kph/18mph after he drove through a round-about without giving way. I smashed his drivers window, cracked his windscreen and dented the front fender. Even at a slow speed, I was sore and bruised for two weeks and my rear wheel needed straightening. So please avoid hitting cars, it HURTS.
CHEERS
Mark