Tension problems

Can someone please tell me how my teacher got Acceleration of 1.44m/s^2?
I dont see how its even possible without another force acting on the object
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Attached Files
File Type: docx Physics.docx (31.3 KB)

http://ift.tt/1d7paAG

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