A compressed spring is released from rest on a frictionless surface, how does the kinetic energy K of the block and potential energy Usp of the spring change? A compressed spring is released from rest on a frictionless surface, how does the kinetic energy K of the block and potential energy Usp of the spring change? K increases and Usp increases K stays the same and Usp stays the same K decreases and Usp decreases K decreases and Usp increases K increases and Usp decreases