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Also M_a > M_b

a.) Find an expression for the magnitude of the linear acceleration of block B in terms of the linear acceleration a_a ( acceleration of block A ) .

My attempt :

Using Newton's law of motion

we have

g.M_a - T1 = M_a . a_a

T2 - g.M_b = M_b. a_b , where a_b is the acceleration of block B

and torque of the pulley : T1.R - T2.R = I (alpha) , where alpha is the angular acceleration

Am I heading the right direction? If so, how could i eliminate both tensions T1 and T2 to get what the question wants ?