Two freight trains each of mass 5 x 106 kilograms 5000, Ask an Expert

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Two freight trains, each of mass 5 X 10⁶ kilograms (5000 metric tons) travel in opposite directions on the same track with equal speeds of 42 meters/second (about 100 miles/hour). They collide head on and come to rest.

a) Calculate in milligrams the kinetic energy for each train (1/2)mv² before the collision (1 milligram= 10^-3 gram= 10^-6 kilogram

b) After the collision the mass of the trains plus the mass of the track of the roadbed has increased by what number of milligrams?

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