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Una màquina de tren necessita 7000 kW per fer avançar un vagó per una via horitz...

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Una màquina de tren necessita 7000 kW per fer avançar un vagó per una via horitzontal amb una velocitat constant de 70 m/s. Calculeu el treball realitzat per les forces de fregament en recórrer 5,0 m. Preneu g = 10 m/s2.

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