A4.0 kg object is acted upon by a 20 n force to the right and a 25 n force to the left. what is the magnitude of the objects accerlation

Netwon's second law states that the resultant of the forces acting on an object is equal to the product between the object mass and its acceleration:


In this problem, the resultant of the forces is
(to the left)
so if we use the previous equation, we find the acceleration of the object:

and the acceleration is to the left, since the resultant of the forces is to the left.