A block of mass m = 5.4 kg, moving to the right on frictionless surface with a speed Vi=9.2 m/s makes a sudden perfectly elastic collision with a second block of mass M. The second block is originally at rest. Just after the collision, the 5.4-kg block recoils with a speed of Vf=2.5 m/s What is the mass M of the second block? O 7.0 kg 9.43kg

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