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A horizontal force Fslide is exerted on a 9.0-kg box sliding on a polished floor. As the box moves, the magnitude of Fslide increases smoothly

A horizontal force Fslide is exerted on a 9.0-kg box sliding on a polished floor. As the box moves, the magnitude of Fslide increases smoothly from 0 to 5.0 N in 5.0 s.

A. What is the box's speed at t = 5.0 s if it starts from rest? Ignore any friction between the box and the floor.

B. What is the box's speed at t = 5.0 s if at t = 0 it has a velocity of 3.5 m/s in the direction opposite the direction of Fslide? Ignore any friction between the box and the floor. Assume that the positive direction is the direction of slide.

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