A cart moving on a low-friction track has a momentum of (6 mathrm{~kg} cdot mathrm{m} / mathrm{s})

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A cart moving on a low-friction track has a momentum of \(6 \mathrm{~kg} \cdot \mathrm{m} / \mathrm{s}\) to the right. At the end of the track is a wall.

(a) What is the momentum of the system that consists of the cart and the wall?

(b) After the cart collides with the wall, the cart's momentum is \(6 \mathrm{~kg} \cdot \mathrm{m} / \mathrm{s}\) to the left. What is the wall's momentum after impact, from the track's perspective?

(c) Is the system defined in part \(a\) an isolated system? Why doesn't the wall move?

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