An empty railroad car of mass M is moving at speed Vo when it strikes an occupie

Question

An empty railroad car of mass M is moving at speed Vo when it strikes an occupied passenger car of mass 2M at rest. The train cars lock together during the collision. What is the ratio of the system's initial kinetic energy to its finial kinetic energy? An empty railroad car of mass M is moving at speed Vo when it strikes an occupied passenger car of mass 2M at rest. The train cars lock together during the collision. What is the ratio of the system's initial kinetic energy to its finial kinetic energy?

Explanation / Answer

Ki/Kf = (1/2)*m*vo^2/[(1/2)*(m+2m)*V^2]...

here V = m*vo/(m+2m) = vo/3...

Ki/Kf = vo^2/(3*vo^2/9) = 3

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