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19.6 Starting from rest, a worker pushes a box of mass m=30kg up an inclined plane of angle 0 - 35 and coefficient of kinetic friction uk. The worker applies a variable force Fa which acts along the plane and the box is displaced a distance d=4m along the plane. If the final speed of the box is v=5m/s, and the work done by the force exerted by the worker is Wa=1300], what is uk? (A) 0.73 (B) 0.14 (C) 0.61 (D) 0.44 (E) 0.26