Consider two comically-large hockey pucks, each with mass 10 kg, on frictionless ice. Puck A is initially moving to the West at 4 m/s towards puck B, which is initially stationary. The pucks collide head on. After the collision, the pucks stick together and move as one object with a common velocity. How much kinetic energy (in joules) is lost in this collision? Justify your answer using your rationale and equations used.

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