Whiplash is common in rear-end collisions at slow speed. Collisions of 5 to 10 miles per hour can cause whiplash. According to Panjabi, et al., a Yale University study explains that ligament, joint, and disc injuries can occur in forces between 6.5 and 5.8 G, typical for crashes less than 15mph. Don't downplay injuries from a low-speed collision since whiplash could be one of them.