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Masses of 1.0 kg, 2.0 kg, and 3.0 kg are each separately subject to a net...

Masses of 1.0 kg, 2.0 kg, and 3.0 kg are each separately subject to a net force in the positive x direction of 22 N. What is the acceleration of the center of mass of the system?

I did 22N/ 1+2+3 = 3.67 m/s^2 but it is saying its wrong. Am I missing something?

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