Physics - NLM Question with Solution | TestHub

In the figure, the blocks A, B and C of mass $m$ each have acceleration $a_1$, $a_2$ and $a_3$ respectively. $F_1$ and $F_2$ are external forces of magnitude $2mg$ and $mg$ respectively. In A the free end of the string is pulled down by $F_1$; in B masses $m$ and $2m$ hang over the pulley; in C two masses $m$ hang over the pulley and $F_2$ pulls one side down. Then: