Answer:
[tex]F_{net} = 0[/tex]
Explanation:
here it is given that the crate is sliding down with constant speed
so we will have
[tex]v = constant[/tex]
now we can say
[tex]a = \frac{dv}{dt}[/tex]
so here we have
a = 0
now from Newton's II law we can say that sum of all forces on the system is always product of mass and its acceleration
so here we will have
[tex]F_{net} = ma[/tex]
[tex]F_{net} = 0[/tex]