Mechanics

I HAD JUST REAR ENDED A CAR AND THERE IS NO VISIBLE DAMAGE AT ALL, I MEAN THERE ARE NO SCRATCHES, OR DENTS, OR ANYTHING. BUT IM JUST WORRIED IF THERE COULD BE ANY INTERNAL DAMAGE, THE CRASH WAS 5MPH OR LESS. AND IF THERE COULD BE DAMAGE HOW MUCH COULD IT

2007 Acura CL