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Please help me solve the following question and show work. Thank you! 3) An object of mass ml = 3000 kg with speed 40 m/s

Please help me solve the following question and show work. Thank you!

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3) An object of mass ml = 3000 kg with speed 40 m/s collides with another object with mass m2 = 2500 kg that is at rest. The two objects after the collision move forward together. a) What is their final velocity? Show your calculations. b) Is the collision elastic or inelastic, why? c) What is the kinetic energy of the system after the collision

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