A sled and rider, gliding over horizontal, frictionless ice at $4.0 \mathrm{m} / \mathrm{s},$ have a combined mass of $80 \mathrm{kg} .$ The sled then slides over a rough spot in the ice, slowing down to $3.0 \mathrm{m} / \mathrm{s}$. What impulse was delivered to the sled by the friction force from the rough spot?
Added by Francisco Jose N.
Step 1
First, we need to find the initial momentum of the sled and rider. Momentum is given by the formula $p = mv$, where $m$ is the mass and $v$ is the velocity. In this case, the initial momentum is $p_i = (80\,\text{kg})(4.0\,\text{m/s})$. Show more…
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