Question

Mass m1 = 11.3 kg is on a horizontal surface. Mass m2 = 5.70 kg hangs freely on a rope which is attached to the first mass. The coefficient of static friction between m1 and the horizontal surface is μs = 0.573, while the coefficient of kinetic friction is μk = 0.130.
a.If the system is in motion with m1 moving to the left, then what will be the magnitude of the system's acceleration? Consider the pulley to be massless and frictionless.

I tried the eq a=(m2g-m1g(uk))/(m1+m2) where uk= the coefficient of kinetic friction but it says my answer isn't correct.

b. If the system is in motion with m1 moving to the right, then what will be the magnitude of the system's acceleration?

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