Physics Problem - Elastic Potential Energy - Determining Work Done and Coefficient of Friction

A glider of mass 0.240 kg is on a horizontal track, attached to a horizontal spring of force constant 6.00 N/m. There is friction between the track and the glider. Initially the spring (whose other end is fixed) is stretched by 0.100 m and the attached glider is moving at 0.400 m/s in the direction that causes the spring to stretch farther. The glider comes momentarily to rest when the spring is stretched by 0.112 m.
(a) How much work does the force of friction do on the glider as the stretch of the spring increases from 0.100 m to 0.112 m?
(b) What is the coefficient of kinetic friction between the glider and the track?
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