A 10.0-kg box is pulled along a horizontal surface by a force of 40.0 N applied at a 30.0° angle with vertical. Coefficient of kinetic friction is 0.30. Calculate the acceleration.   A. 0.52 m/s2   B. 3.76 m/s2   C. 1.12 m/s2   D. 3.16 m/s2   E. None of the above

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