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There is three object that have same mass 100g. Each object velocity is V1=25.0i m/s, V2=-9.45i...

There is three object that have same mass 100g. Each object velocity is V1=25.0i m/s, V2=-9.45i m/s + 11.6j m/s, and V3= -3.67i m/s -11.6j m/s. Calculate center of mass, and inner kinetic energy?

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