The diagram shows a horizontal spring attached to a block. The block's equilibrium position is at C, and the block oscillates between the points A and E with no friction from the floor. As the block moves from C to A, which of the following statements is true? Usp is the spring potential energy of the spring and K is the kinetic energy of the block. mass spring system Usp decreases, K decreases Usp stays the same, K stays the same Usp increases, K increases Usp decreases, K increases Usp increases, K decreases