A block of mass M is at rest on a ramp that is inclined at an angle with respect to the horizontal. frictional forces are considered to be non-negligible. The block is pushed against a spring and then held in place. The spring is compressed a distance of X₁, and the spring is not secured to the block. The block is released from rest, travels up the incline, and comes to rest after traveling a distance D, as shown above. Which of the following claims correctly describes the energy of the system under consideration from when the block compressed spring and when the block his travel a distance de along the incline? Select two answers.

A) The mechanical energy of the system consisting of the spring increases by 1/2kx₁²

B) The mechanical energy of the system consisting of the block does not change

C) The mechanical energy of the system consisting of the block and earth increases by more than zero but less than 1/2kx₁²

D) The mechanical energy of the system consisting of the spring, block, and earth increases by 1/2kx₁²