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OpenStudy (anonymous):
A single 1,300 kg cargo train car is rolling along a train track at 2.0 m/s when 400 kg of coal is dropped vertically into it. What is its velocity right afterward? Assume a closed system
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OpenStudy (anonymous):
Let's use conservation of momentum. \[m_t v_1 = (m_t + m_c) v_2\]
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