A 0.40kg block is held against a compressed spring of stiffness 68.2N/m and compression 0.64m parallel to a 24 degree incline that is 1.27m 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 0.40kg block is held against a compressed spring of stiffness 68.2N/m and compression 0.64m parallel to a 24 degree incline that is 1.27m 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?

Alphonse · Answer

What is the work done by kinetic friction along the length of the incline?

What is the work done by the spring while the block is in contact with it?

What is the speed with which the block leaves the incline?