Professor Walo pushes the 80 kg grandmother by a slope of 30 °, applying a force F an angle of 15 ° as shown in the picture. If the teacher started pushing the grandmother from the base of the inclined plane starting from rest, and reaches a speed of 6 m / s after traveling 10 meters along along the slope (flat). What was the force applied by teacher Walo if µ = 0.08?

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