P Block X of mass mois at rest at the top of a ramp, and the block's center of mass is at a height H above the ground. Block X is then released from rest, and it slides down the ramp and collides with block Y of mass mo, which is initially at rest and has its center of mass at a height h above the ground. At the moment before the collision, block X has a speed of vo- After the collision, block Y travels such that it lands at point P. Consider the block X-block Y system from the moment in time that block X is released from rest to the moment immediately after block X collides with block Y. Which of the following claims best describes the system? A Because the total momentum of the system does not remain constant, the system is open. B. Because the total kinetic energy of the system does not remain constant, the system is open с Because the total momentum of the system remains constant, the system is closed Because the total kinetic energy of the system remains constant, the system is closed​