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Two identical objects, each with a mass M, are attached to each other via a spring...

Two identical objects, each with a mass M, are attached to each other via a spring with a spring constant k. The two objects are oscillating such that one is always moving in the opposite direction and with the same speed as the other. If the two objects were made to oscillate with a higher amplitude,

A. the total mechanical energy would increase
B. the average kinetic energy of each object would increase
C. the average potential energy of the spring would increase
D. All of the above

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