Give a very short answer to the question given below.
 
Four boxes of varying masses are pushed by a man.

The resulting acceleration for each box is recorded in the table.
 
Mass of the box
(\(kg\))
Acceleration produced
(\(m/s^2\))
10 200
20 100
40 50
80 25
 
What is the magnitude of the force exerted by the man on each box? Is this force balanced or unbalanced in each case?
 
The formula to calculate the force is,
Here, in each case, the force is 
Here, the force acting on each box is as acceleration in each case and each box gets pushed.