Question

pls can anyone help me...​

Answer 1

As the given surface between wall and block A is smooth, so here no friction is acting, so blocks will fall down.

Therefore blocks can't be in equilibrium.

Friction force acts only when there is relative motion or tendency of relative motion between blocks. But here due to gravity both are going downward with same acceleration g. There is no tendency of relative motion as both of them accelerated by external force with same acceleration. So friction force between them is zero.

I HOPE IT HELPS.