A 5000-kg freight car runs into a 10000-kg freight car atrest. They couple upon

Question

A 5000-kg freight car runs into a 10000-kg freight car atrest. They couple upon collision and move with a speed of 2 m/s.What was th initial speed of the 5000-kg car? Please help me understand how you got your answer by useingsteps in details. Thank You A 5000-kg freight car runs into a 10000-kg freight car atrest. They couple upon collision and move with a speed of 2 m/s.What was th initial speed of the 5000-kg car? Please help me understand how you got your answer by useingsteps in details. Thank You

Explanation / Answer

Eastic collision with an object at rest, we can useconservation of momemtum: m(1) = 5000 kg m(2) = 10000 kg v(1i) =??              ----> initial velocity for mass 1 v(1f) = 2m/s          ----->final velocity for mass 1 v(2f) = 2m/s          ----->final velocity for mass 2 m(1)v(1i) = m(1)(v1f) + m(2)(v2f) (5000)(v1i) = (5000)(2) + (10000)(2) v1i = 30000/5000 v1i = 6 m/s Hope this helps.

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