Beginning at time t = 0, a student exerts a horizontal force on a box of mass 30 kg, causing it to move at 1.2 m/s toward an elevator door located 16 m away, as shown above. The coefficient of kinetic friction uk between the box and the floor is 0.20. (b) Calculate the magnitude of the horizontal force the student must exert on the box in order to keep it moving at 1.2 m/s.

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