A piece of ice with a mass of 4 kg slides to the right at 20 m / s in a frictionless environment completely covered with ice. After a while, this piece of ice collides with another piece of ice with a mass of 4 kg and sticks. (a) Find the maximum height at which pieces of ice moving together can come out after the collision. (b) What are the physical quantities conserved in this problem? Please explain.

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