Física Centro de masa Ejemplo 1

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=JMcvK3n611M

Cuatro cuerpos están situados a lo largo del eje x como sigue: un cuerpo de 2 kg está a +3 m, un cuerpo de 3 kg está a +2.5 m, un cuerpo de 2.5 kg está en el origen y un cuerpo de 4 kg está a -0.5 m. ¿Dónde está el centro de masa de estos 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