84 Kg Mass Attached Light Cord Passes Over Massless Frictionless Pulley Other End

A 8.4 kg mass is attached to a light cord that passes over a massless, frictionless pulley. The other end of the cord is attached to a 3.7 kg mass. Use conservation of energy to determine the final speed of the first mass after it has fallen (starting from rest) 7.6 m .The acceleration of gravity is 9.8 m/s 2. Answer in units of m/s

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