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A roller skater on frictionless roller skates pushes a second roller skater on frictionless roller skates up a smooth curved ramp. Which of the following statements about the linear momentum and mechanical energy of the system is true? Select all the statements that are correct.
A.Mechanical energy of the two skaters system is conserved over the entire process.
B. Linear momentum of the two skaters system is conserved over the entire process.
C. Mechanical energy is conserved immediately before and after the first skater pushes the second skater.
D. Linear momentum is conserved immediately before and after the first skater pushes the second skater.
E. Mechanical energy is conserved for the second skater after being pushed up the ramp.
F. Linear momentum is conserved for the second skater after being pushed up the ramp.
G. Neither mechanical energy nor linear momentum is conserved of the two skaters system over the entire process.

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