A railroad boxcar rolls on a track at 3.10 m/s toward two identical coupled boxcars, which are rolling in the same direc

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A Railroad Boxcar Rolls On A Track At 3 10 M S Toward Two Identical Coupled Boxcars Which Are Rolling In The Same Direc 1 (106.66 KiB) Viewed 44 times

A railroad boxcar rolls on a track at 3.10 m/s toward two identical coupled boxcars, which are rolling in the same direction as the first, but at a speed of 1.20 m/s. The first reaches the second two and all couple together. The mass of each is 2.10 × 104 kg. (a) What is the speed (in m/s) of the three coupled cars after the first couples with the other two? (Round your answer to at least two decimal places.) 1.83 m/s (b) Find the (absolute value of the) amount of kinetic energy (in J) converted to other forms during the collision. 105 What is the total initial kinetic energy of all three cars? Recall that initially, two cars travel at the same speed, while another travels at a different speed. What is the total final kinetic energy of all three cars? Recall that after the collision they all have the same speed. What is the difference between these two energies? Note the question is asking for the absolute value of that difference. J