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mechanics

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Jayden holds a 3kg block pressed up against a spring on a horizontal and frictionless surface. The spring has a spring constant of 300Nm. The spring is fixed in place, but the block is free to move. The spring is initially compressed by .5 m and the block is at rest. Jayden lets go of the block and it begins to move. What is the speed of the block when the spring is compressed by .4 m? (The block stays in contact with the spring at all times.)



If needed, g=10ms2.

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