Sleds, having rolled down from the mountain, move along a horizontal road. After a while, the sled stops.

Sleds, having rolled down from the mountain, move along a horizontal road. After a while, the sled stops. How does their kinetic energy change (increase or decrease)?

When the sled rolls off the mountain, their kinetic energy increases; when the sled moves along a horizontal road, their kinetic energy decreases as a result of the action of the friction force.

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