Answer to Question #149025 in Physics for Grace

Question #149025
An old go-kart with a mass of 300 kg is traveling in a straight line at 80 m/s. It is
followed by a 4-wheeler with mass of 200 kg moving at 60 m/s. How fast is the center
of mass moving?
1
Expert's answer
2020-12-06T17:19:50-0500
vcm=m1v1+m2v2m1+m2vcm=300(80)+200(60)300+200=72msv_{cm}=\frac{m_1v_1+m_2v_2}{m_1+m_2}\\ v_{cm}=\frac{300(80)+200(60)}{300+200}=72\frac{m}{s}


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