Physics - NLM Question with Solution | TestHub

Let the wedge acceleration be $a_2$ (left) and the hanging mass acceleration $a_1$ (down).
The string constraint gives the top block $M$ a ground acceleration $a_1-a_2$.
Equations
$$2Mg-T=2M{a}_1$$
$$T=M(a_1-a_2)$$
the normal between $2M$ and the wedge face
$$N=2M{a}_2$$
for the wedge
$$T-N=5M{a}_2.$$
From the last two
$$T=7M{a}_2$$
then
$$a_1=\frac{8T}{7M}$$
and
$$2Mg=\frac{23T}{7}$$
giving
$$a_2=\frac{2g}{23}.$$
Option B.