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Q. A railroad car of mass 2.50 x10^4 kg is moving with a speed of 4.09 m/s. It collides and couples with three other coupled railroad cars, each of the similar mass as the single car and moving in the same direction with an initial speed of 2.05 m/s. How much energy is transformed into internal energy in the collision?

Q. A 5* 10^2 kg hot air balloon takes off from rest at the surface of the earth. The non conservative wind and lift forces take the balloon up, doing +9.70*10^4J of work on the balloon in the process. At what height above the surface of earth does the balloon have a speed of 8m/s?

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