Answer:
The box will move to the right with increasing speed
Explanation:
According to Newton's second law:
(1)
where
F is the net force on an object
m is the mass of the object
a is its acceleration
For the box in this problem, there is only one force acting on it: a force of 5 N from the left (so, to the right). This means that according to (1) the box will experience an acceleration: the direction of the acceleration is the same as the direction of the net force (so, to the right), therefore the box will move to the right and its speed will continue increasing due to fact that it is being accelerated.