Question: The same toy train setup is used, but now there is friction along the horizontal surface ( 2 ) with a coefficient of kinetic friction

The same toy train setup is used, but now there is friction along the horizontal surface (2) with a coefficient of kinetic friction equal to 0.3. The distance 2 is 40.
How much does friction cause the thermal energy of the system to increase as the train travels along the
horizontal surface (2)?

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