Question

Suppose the block is released from rest with the spring compressed 5.50 cm. The mass of the block is 1.60 kg and the force constant of the spring is 965 N/m . Assume the surface is frictionless.

A) What is the speed of the block when the spring expands to a compression of only 2.50 cm ?
B) What is the speed of the block after it leaves the spring?