6. Two carts, of mass 4.5 kg and 1.0 kg, are moving towards each other along the same straight, level track at 2.0 m/s to the right and 4.0 m/s to the left, respectively. Their collision is cushioned by an elastic spring between them. If the force constant of the spring is 900 N/m, what is its maximum compression during the collision?
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