A railroad car with a mass of 2 x104 kg moving at 3.0 ms, Ask an Expert

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Q. A railroad car with a mass of 2 x10^4 kg moving at 3.0 m/s collides and joins with 2 railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.20 m/s.

a. what is the speed of the 3 joined cars after collision?

b. What is the decrease in kinetic energy throughout the collision?

Q. What is the rms speed of nitrogen molecules contained in an 9{rm m}^3 volume at 2.9 atm if the total amount of nitrogen is 2000 mol?

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