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fsm

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Figure shows a block of mass m resting on a 20 degree slope. The block has coefficients of friction mu_s =0.80 and mu_k =0.50 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass 2.0 kg.

If this minimum mass is nudged ever so slightly, it will start being pulled up the incline. What acceleration will it have?

My equation I have is:

T-f_k-(mg*sin(theta))=m*a

where f_k=u_k*(mg*cos(theta))

I keep getting the answer wrong. Is it my formula?