A spring with spring constant k=70 kN/m is used to stop the box of mass m with initial velocity V1= 7 m/s. The spring is initially compressed 100 mm with cables. Since the box produces a maximum compression x=60 mm in the spring. m= 60 kg.  s=750mm (a) Find the kinetic coefficient of friction between the surface and the box. (b) Find the velocity of the box as it moves back from its original position.

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