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A mass of 2 kg is placed on a horizontal surface with a coefficient of kinetic...

A mass of 2 kg is placed on a horizontal surface with a coefficient of kinetic friction of 0.3. A force is applied vertically downward to it and another force of 85 Newtons is applied at 18 degrees below the horizontal. As it moves 9 meters in the +x direction it loses 160 Joules of kinetic energy. What is the amount of the force which is applied downward in Newtons?

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