A 5 kg package of tamales (see the figure below) slides along a floor with speed v1 = 4 m/s. It then runs into and compresses a spring, until the package momentarily stops. Its path to the initially relaxed spring is frictionless, but as it compresses the spring, a kinetic frictional force from the floor, of magnitude 12 N, acts on the package. If k = 8400 N/m, by what distance d is the spring compressed when the package stops? What makes up the system in this problem and state a reasonable assumption about this system?

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