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A railroad car of mass \(3.3 \times 10^4 \, \text{kg}\) moving at \(5.00 \, \text{m/s}\) collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at \(1.20 \, \text{m/s}\).

(a) What is the speed of the three coupled cars after the collision?
[________] m/s

(b) How much kinetic energy is lost in the collision?
[________] J

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