2. A 6.8 kg object is moving along a rough horizontal surface at a constant speed of 2.0 m/s. It is being pushed across by a horizontal force F.At a certain position x = 0.0 m, the magnitude of the horizontal force F is varied given by the graph below. F (N) 15.0 10.0 4.0 10.0 x (m) While the horizontal force is increased, the magnitude of the friction acting on the object remains the same. What is the speed of the object at x = 10.0 m? 3.4 m/s 4.0 m/s 6.4 m/s 6.7 m/s

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