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Block 1 of mass 2.0 kg is sliding to the right with velocity 8.5 and collides...

Block 1 of mass 2.0 kg is sliding to the right with velocity 8.5 and collides with blocks 2 mass 1.5 kg moving with velocity -2. The collision is perfectly elastic. What is the velocity of block 1 after the collision? Positive velocity indicates motion to the right while negative velocity indicates motion to the left.

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