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30.A box of mass 20 kg is pulled at an acceleration of 3.5 m/s2 with the force applied at an angle of 300 respect to

30.A box of mass 20 kg is pulled at an acceleration of 3.5 m/s2 with the force applied at an angle of 300 respect to the horizontal and the coefficient of friction is 0.5, what force necessary to maintain this acceleration? What is the magnitude of the Normal force?

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