4.6875x10^18 J, is:
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- convert 3.65g/cm^3 into kg/ft^2Answer: −465.584 J13. A railroad car of mass 2.50 X 104 kg is moving with a speed of 4.00 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and mov- ing in the same direction with an initial speed of 2.00 m/s. (a) What is the speed of the four cars after the collision? (b) What is the decrease in mechanical energy in the collision?