Illinois State UniversitySchool of Kinesiology & RecreationKNR 352, Quantitative BiomechanicsForensic Biomechanics ProjectIn May, 2007 a women’s body was found face down in a creek under a roadway/pedestrian bridge in a city in central Illinois. The police suspected foul play and questioned the boyfriend of the deceased. Theywere dubious of the first story he presented regarding his interaction with his girlfriend on the bridge, and became suspicious when he provided a second version of the events during the same interrogation. The forensic unit of the local and state police carefully recorded details of the environment near the bridge, and both the local coroner and a forensic pathologist examined the body. The purpose of this project is twofold: 1) Evaluate the biomechanical plausibility of the two stories provided by the boyfriend.2) Provide a justified explanation of what probably occurred on the bridge. For both 1 and 2, you must account for the layout of the scene, the anthropometrics of the deceased and her boyfriend, and the injuries sustained by the deceased. Your explanation must be based on the fundamental laws/principles of physics, and relevant biomechanics literature to justify assumptions you make regarding the activity on the bridge. As possible, you will use Excel to expand relevant equations to create figures used to justify your explanation. Relevant data, as provided by the police agencies involved, is provided below and in the images on the website Stories provided by the BoyfriendStory 1: the boyfriend and deceased were attempting to light a crack pipe while standing on the bridge. The deceased was hopping backwards, tried to hop up onto the handrail, and inadvertently went over the handrail. Story 2: the couple was engaged in an argument, and the boyfriend tried to grab the deceased. The deceased pulled away from the boyfriend, spun around to her left, struck the handrail with the right sideof her torso, and inadvertently went over the handrail. Report of the Forensic PathologistThis report states that the abrasions and contusions sustained by the deceased indicate that she struck the I-beam during her fall from the bridge to the creek. The pattern of contusions (bruises) on the left arm and torso suggest that her left arm was draped over the I-beam when she struck. The broken mandible and laceration on her chin resulted from contact with either the I-beam or the underlying concrete basin.Anthropometrics (access a Table of Anthropmetric Proportions )Deceased Boyfriend5’2” (1.57 m) tall 5’9”128 lbs. 170 lbsAverage build Muscular buildEnvironment/Layout of the SceneThe most notable unusual feature about the bridge environment is the presence of a steel I-beam to the west of the structure (see documents East View of Bridge and Top View of Bridge). The horizontal distance from the handrail to the I-beam is 50” (1.27 m). The vertical distance from the top of the handrail to the top surface of the I-beam is 105.8 inches (2.69 m). According to the forensic pathologist, contact with the I-beam was responsible or potentially responsible for the abrasions, contusions and fractures evident on the deceased. The walkway portion of the footbridge is 4’11” wide. The walkway has handrails on both sides, 37.1” (.94 m)