Solving a Problem: What Went Wrong & Velocity for Both Masses

[Mohmmad Maaitah]

Homework Statement

As in the first provided picture:

Relevant Equations

Newton second law

This is the problem:

And this the answer provided by the examiner:

And this is my own answer:

So what did I get wrong???
Also I want to know if the Velocity is the same for both masses.

 

[Doc Al]

So what did I get wrong???

The diagram shows m_1 as the hanging mass, but the given solution switches that. Your work is fine.

Also I want to know if the Velocity is the same for both masses.

Sure---they are connected. (The speeds are the same, but they move in different directions, of course.)

 

[Mohmmad Maaitah]

The diagram shows m_1 as the hanging mass, but the given solution switches that. Your work is fine.

Sure---they are connected. (The speeds are the same, but they move in different directions, of course.)

Oh lord, he switched the masses