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A boy is pulling a toy box across a horizontal rough surface. If his pulling force...

A boy is pulling a toy box across a horizontal rough surface. If his pulling force is 60 Newton, what is the acceleration of the box, given that mass of the box m = 18 kg, the angle of his force with respect to the horizontal θ = 20°, that the kinetic frictional coefficient between the box and the surface μk = 0.15

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