Alisha starts pulling (from rest) a box full of books on a horizontal floor. She has tied the rope to the box, the rope makes an angle of 40.0° relative to the floor. She pulls with a force F of magnitude 120N. The total mass of the box is 50.0kg. She pulls the box in a straight line over a distance of 6.00m. There is 70.0N friction force between the floor and the box. Calculate the final speed of the box
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