Answer:
 5 N. 
 
Explanation: 
 
We can calculate the net force on the object by using Newton's second law of motion: 
 
 
 
F is the net force on an object 
 
m is the mass of the object 
 
a is its acceleration 
 
For the object in this problem, we have 
 
m = 1 kg is its mass 
 
 is its acceleration 
 
Substituting into the equation, we find the net force: