A railroad car of mass m is moving at speed v when it collides with a second railroad car of


A railroad car of mass m is moving at speed v when it collides with a second railroad car of mass M which is at rest. The two cars lock together instantaneously and move along the track. What is the kinetic energy of the cars immediately after the collision?
a. 12(M + m)(Mv2(M+m)(mv2(M+m)(mv****************/


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