A block of mass 0.10kg is attached and secured to one end of a spring with spring constant 50Nm. The other end of the spring is secured to a wall. The block is pushed against the spring, which compresses the spring to a position of x=−0.04m. When uncompressed, the end of the spring that is attached to the block is at a position of x=0.00m . The block-spring system is then released from rest, and the block travels along a horizontal, rough track. A motion sensor is placed so that it measures the velocity of the object as it slides along the track. A graph of total mechanical energy of the block-spring system as a function of position is shown. Which of the following statements about the block-spring system are true? Select two answers.