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A large 5-kg marble moves at a speed of 20 m/s. It collides with a second marble whose mass is 10-kg, moving at 10

A large 5-kg marble moves at a speed of 20 m/s. It collides with a second marble whose mass is 10-kg, moving at 10 m/s in the same direction. After the collision, the 5-kg marble continues with a speed of 8 m/s in the same direction. (A) What is the speed of the 10-kg marble? (B) What is the initial and final kinetic energies of the system?

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