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A 10 kg box was lying on a smooth surface. A rope was connected to the...

  1. A 10 kg box was lying on a smooth surface. A rope was connected to the box. The box was pulled by the rope at angle of 30° with the horizontal.    What applied force will keep the box moving upward at a constant speed?
  2. A 10 kg box was resting on an inclined rough surface, which makes an angle of 30° with the horizontal. The coefficient of kinetic friction between the surface and the box is 0.4. The box was pulled down the ramp by a rope that was parallel to the inclined surface. What was the applied force when box gained an acceleration of 2.0 m/s2?   
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