I'm trying to understand the concept of the following situation: A 75.0-kg ice skater moving at 10.5 m/s crashes into a stationary skater of equal mass. After the collision, the two skaters move as a unit at 5.25 m/s. Suppose the average force a skater can experience without breaking a bone is 3,867 N. If the impact time is 0.112 s, does a bone break? By using F= (MV)/t = [(75 kg) (5.25 m/s)] / 0.112s I found what I believe may be the correct answer (3515.63 N) so not a single bone breaks, but what I'm not understanding is the concept behind this solution. Any help would be much appreciated.