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principles of physics

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Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at ____________________.
A) 0.5 m/s.
B) 1 m/s.
C) 1.5 m/s
D) 2 m/s
E) 2.5 m/s.

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