A 0.450 kg block is held against a compressed spring of stiffness 60 N/m and compression 0.71 m parallel to a 27.0 degree incline that is 1.18 m long. The coefficient of kinetic friction between the block and the incline is 0.34. The external force holding the block against the compressed spring is then removed, and the compressed spring pushes the block up the incline from rest. What is the work done by gravity on the block along the length of the incline?

Question

A 0.450 kg block is held against a compressed spring of stiffness 60 N/m and compression 0.71  m parallel to a 27.0 degree incline that is 1.18 m long.  The coefficient of kinetic friction between the block and the incline is 0.34.  The external force holding the block against the compressed spring is then removed, and the compressed spring pushes the block up the incline from rest. What is the work done by gravity on the block along the length of the incline?