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Una caja de 85 N con naranjas se empuja por un piso horizontal, y va frenándose a una
razón constante de 0.90 m/s cada segundo. La fuerza de empuje tiene una componente horizontal de 20 N y una vertical de 25 N hacia abajo. Calcule el coeficiente de fricción cinética entre la caja y el piso.
Sagot :
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