In informal everyday US English, we say "the car got rear-ended." When a car is hit from behind, it is "rear-ended." If it happened to me, those are the words I'd use when when I called my insurance company. Here's an example of use: "Legally, in the United States, when a car is rear-ended it is rarely considered the driver's fault, no matter how fast he stops. It is considered to be the responsibility of the driver behind to follow at a safe distance." Here are some other phrases used informally in the United States. When two cars, A and B, drive directly toward each other and the front of car A hits the front of car B, that is "a head-on collision." When car A is driving through an intersection, and car B drives in from the side, so that the front of car B hits the side of car A, car A "got T-boned." When cars A and B are driving in the same direction next to each other on a wide road, and car B veers out of its lane so that the side of car B scrapes or pushes against the side of car A, car A "got side-swiped." When cars A and B have a low-speed collision--perhaps in a parking lot--and nobody is hurt, but there are dents and damage that will be expensive to repair, that's a "fender-bender." When a collision occurs, drivers are supposed to stay at the scene, exchange information, and call the police. If driver B hits car A and then drives away, that is called "hit-and-run." It is against the law, and driver B will be in serious trouble when he is caught.

You could use smash into or bump into: to make something such as a vehicle hit another vehicle or object; shunt: a situation in which several cars crash into each other in a line. Here is a link that might help you: https://www.macmillandictionary.com/thesaurus-category/british/vehicle-accidents-and-breakdowns

The term is “rear-ended.” The past and past participle of “hit” is... hit. Please, no more “hitted” for the rest of your life! [emoji][emoji][emoji]