23) We need to find the acceleration of mass m[2]. It is important to realize that m[1] and m[2] will accelerate at the same speed. The system as a whole accelerates together. So, we can also use net force to solve for the net acceleration.
The net force will be 12 because the other forces(weight and normal force) will cancel out. our total mass will simply be the sum of m[1] and m[2]. After plugging these values in, we can solve for the net acceleration, our answer.
Answer: C
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