An inclined plane makes an angle of 30 with the horizontal. Find the constant force, applied parallel

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An inclined plane makes an angle of 30° with the horizontal. Find the constant force, applied parallel to the plane, required to cause a 15-kg box to slide 

(a) Up the plane with acceleration 1.2 m/s2 and 

(b) Down the incline with acceleration 1.2 m/s2. Neglect friction forces.

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