The severity of many sports injuries is related to the magnitude of the acceleration that an athlete's body undergoes as it comes to rest, especially when joints (such as ankles and knees) are not properly aligned during falls. Estimate the magnitude of the acceleration a mud of a world-class athlete who falls while running at full speed and comes to rest on a muddy field. Assume the runner falls face first and does not roll. amud = -100 Incorrect m/s Estimate the magnitude of the acceleration a track for the same athlete falling while running at full speed and coming to rest on a running track made from a synthetic material. atrack= -20 Incorrect m/s