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A cannon is rigidly attached to a carriage,which can move along horizontal rails but is connected to a post by a large spring, initially unstretched, of force constant 60000 N/m. The cannon fires a 305 kg projectile at a velocity of 174 m/s directed 38.9◦ above the horizontal.If the mass of the cannon and its carriage is 5537.7 kg, find the recoil velocity of the cannon. Answer in units of m/s
Can you PLEASE help me set up the conservation of momentum in the X!!!!

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