Blocks of mass m₁and m₂are connected by a massless string that passes over the pulley in Figure P12.65. The pulley turns on frictionless bearings. Mass m₁slides on a horizontal, frictionless surface. Mass m₂is released while the blocks are at rest.a. Assume the pulley is massless. Find the acceleration of m₁and the tension in the string.b. Suppose the pulley has mass m_pand radius R. Find the acceleration of m₁and the tensions in the upper and lower portions of the string. Verify that your answers agree with part a if you set m_p= 0.

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m, m2 FIGURE P12.65