Acceleration of the system \(=\frac{P}{m+M}\)
The force exerted by rope on the mass \(=\frac{M P}{m+M}\)
\(=\frac{(M)(2Mg)}{(M/2)+M}=\frac{4 Mg}{3}\)
[$\sin \left(35^{\circ}\right)=0.573, \cos \left(35^{\circ}\right)=0.819$ $\left.\sin \left(110^{\circ}\right)=0.939, \cos \left(110^{\circ}\right)=-0.342\right]$