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A mass m=4.5kg is connected to a spring. The force constant of the spring is k = 2.1N m.
Another block with the same mass comes from left and hits the first. The collision is elastic, the
surface is smooth and the initial velocity of the second block is v = 2.5m · s 1. What is the largest
length can the spring be compressed after the collision?( Round to the nearest hundredth.)

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