Spring and friction assignment

[kar_04]

another physics question..please

Albertine sits ina reclining chair, in front of a large, compressed spring. The spring is compressed 5m from its equilibrium position, and a glass sits 19.8 m from her outstretched foot. Assuming that Albertine's mass is 60kg what is the coefficient of kinetic friction between the chair and the waxed floor?

U(kinetic) = F/N
N= 588
F=??
a=??

 

[chaoseverlasting]

Assuming that she just touches the glass, 0.5kx^2=\mu mgx where x is 19.8 m, but you don't know k (spring const) which is reqd.