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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.