Homework Help: Physics

Posted by Cassie on Tuesday, November 13, 2012 at 5:19pm.

A sled and rider, gliding over horizontal, frictionless ice at 4.9{\rm m/s} , have a combined mass of 86{\rm kg} . The sled then slides over a rough spot in the ice, slowing down to 2.1{\rm m/s}

What impulse was delivered to the sled by the friction force from the rough spot?

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