A 68.5-kg skater moving initially at 2.40 m/s on rough horizontal ice

A 68.5-kg skater moving initially at 2.40 m/s on rough horizontal ice

 
Description: A 68.5-kg skater moving initially at 2.40 m/s on rough horizontal ice comes to rest uniformly in 3.52 s due to friction from the ice. What force does friction exert on the skater?

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