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the radius of the pulley is 150mm and weighing 15kg, the spring constant is k=120n/m. the mass m=20kg. the system is re...

the radius of the pulley is 150mm and weighing 15kg, the spring constant is k=120n/m. the mass m=20kg. the system is released from rest with the spring unstretched of 80mm. determine how fast the mass is moving when it has fallen .75m
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