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Two masses, m₁ =15 kg, m₂ = 3kg in Atwood's machine are connected over the frictionless pulley that is a uniform disk with a radius of 12cm. The mass of the pulley is 0.2 kg. Use conservation of energy to solve for the final speed of block m₁ and m_2,when the block m₂moves down a distance of 1.2 m.

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