Question

Q1. Two masses of 7kg and 3kg respectively are hanging on a frictionless pulley... Calculate the acceleration due to gravity...

Answer 1

I think that your problem can be represented by this drawing:

here we can write the subsequent equations:
\[\left\{ \begin{gathered}
- {m_A}g + \tau = {m_A}a \hfill \\
- {m_B}g + \tau = - {m_B}a \hfill \\
\end{gathered} \right.\]