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4. In an elastic head-on collision, a 0.60 kg cart moving at 5.0 m/s [W] collides
with a 0.80 kg cart moving at 2.0 m/s [E]. The collision is cushioned by a spring
(k = 1200 N/m).
i. Determine the velocity of each cart after the collision.
ii. Determine the maximum compression of the spring.

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