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8b.6 A block with mass of 2.00 kg slides across a horizontal frictionless counter. It then runs into and compress a spring of spring constant

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8b.6 A block with mass of 2.00 kg slides across a horizontal frictionless counter. It then runs into and compress a spring of spring constant k = 100 N/m. After a compression distance of 30 cm. its speed reduced to 5.00 m/s. What is the initial speed of the block before it compresses the spring? [Answer: 5.43 m/s]

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