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a.) In terms of the given quantities and g, find the tensions, T1 and T2 for each section of string.

For this I have the Sum of Fy= 2m(g-a)=T1 for Fx= T2= 7ma which the anwer given is different. The t1 is correct! But is this a typo or am I wrong?

b.) If a=2m/s^2, determine the kinetic coefficient of friction between blocks B and C.

I was thinking the force of friction would be equal to the tension in the x direction but when I work that out I dont get the right answer. Is that the right concept?

c.) What is the acceleration of block C at this time?

I dont have any work for this part yet but I'll put it on here just in case.