Make was Delorian, model was DMC-12, which is the only model the Delorian Motor Company made before going bankrupt. Note, the Mr. Fusion unit was not a standard accessory.
Delorian runs the 100 and 200 meters. He can also run the 400 and 800 meters for long distance.
No, cars don't get destroyed like that. In the scene at the end of Back to the Future 3 where the train runs into the Delorian, they used a collapsible prop that looked like the car. They used it so the Delorian would appear more thoroughly destroyed and it wouldn't damage the train.
As safe as any other car of the era.
Because its not really a Mazda 626... Its a Delorian... ..