1) Railroad car A, with mass 6275 kg, is traveling east at 6.5 m/s along a straight track. It strikes railroad car B, with mass 5155 kg, which is also traveling east along the same track at 3.8 m/s. The two railroad cars stick together. Assume the track is frictionless. How fast do the two attached railroad cars move immediately after the collision? a. ANALYZE AND SKETCH THE PROBLEM Knowns Unknowns mA = _________________ vAi = ________________ _________ = ? mB = _________________ vBi = ________________ B. SOLVE FOR THE UNKNOWN Define the system ______________________________________ Write Pi = Pf in terms of the railroad cars’ masses and velocities. Solve for vf
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