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OpenStudy (anonymous):
A 9500 kg boxcar traveling 15.0 m/s hits a second boxcar at rest. The two stick together and move off with a speed of 6.0 m/s. What is the mass of the second car
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OpenStudy (anonymous):
Use the conservation of momentum\[m_1 v_1 + m_2 v_2 = (m_1+m_2) v'\]
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