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OpenStudy (anonymous):

A 480-kg car moving at 14.4 m/s hits from behind a 570-kg car moving at 13.3 m/s in the same direction. If the new speed of the heavier car is 14.0 m/s, what is the speed of the lighter car after the collision, assuming that any unbalanced forces on the system are negligibly small?

OpenStudy (jfraser):

use conservation of momentum\[(m_1*v_1 + m_2*v_2)_{initial} = (m_1*v_1 + m_2*v_2)_{final}\]

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