The static friction between the block and the plane is [tex]40(\mu_s) \ N[/tex].
The given parameters:
The normal reaction on the rough surface due to weight of the block is calculated as follows;
[tex]F_n = 40 \ N[/tex]
The static friction between the block and the plane is calculated as follows;
[tex]F_s = \mu_s F_n[/tex]
where;
Thus, the static friction between the block and the plane is [tex]40(\mu_s) \ N[/tex].
Learn more about static friction here: https://brainly.com/question/13680415