Final answer:
The box will not move because the force of static friction is greater than the applied force.
Step-by-step explanation:
The box will not move. When a horizontal force of 1.5 N is applied to a box weighing 20 N, if the force of static friction is greater than or equal to the applied force, the box will not move.
In this case, the applied force of 1.5 N is less than the product of the coefficient of static friction (0.3) and the weight of the box (20 N). Therefore, the box will remain stationary.