Answer:
The magnitude of the frictional force is [tex]F_f \ge 50 \ N[/tex]
Explanation:
From the question we are told that
The force exerted on the box is [tex]F = 50 \ N[/tex]
Generally for the box to remain at rest then it means that the frictional force is greater than or equal to the force applied to move it i.e
[tex]F_f \ge F[/tex]
=> [tex]F_f \ge 50 \ N[/tex]
