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A sled and rider, gliding over horizontal, frictionless ice at 4.8 m/s , have a combined...

A sled and rider, gliding over horizontal, frictionless ice at 4.8 m/s , have a combined mass of 72 m/skg . The sled then slides over a rough spot in the ice, slowing down to 2.8m/s .
What impulse was delivered to the sled by the friction force from the rough spot?
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