5. A 4.0kg mass is connected by a massless string over a massless and frictionless pulley to the center of an 8.0kg wheel. Assume that the wheel has a radius of 0.50m and a moment of inertia of 2.0kgm'. The mass is released from rest at a height of 2.0m above the ground. What will its speed be just before it hits the ground?

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