The first image demonstrates a 50cm x 1.5cm abrasion/contusion involving the anterior chest wall, running diagonally from the right shoulder, across the chest, to the left flank area. This represents a classic "seat belt mark" in a restrained passenger.
The second image demonstrates complete transection of the aorta and pulmonary artery near their origin at the heart. This is an unusual area of transection in acceleration-deceleration injuries. The classic description is in the proximal descending aorta, just after the arch.