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A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a...

A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use the following variables as necessary: m, v_1 for v1, and v_2 for v2.) What is the change in kinetic energy of the car–truck system in the collision?

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