Here we have to use Newton's Second Law of mechanics,
where `m` is a mass of an object, `F` is a net force of all forces acting on it, and `a` is a resulting acceleration.
This equation is true in a vector form (actually, `a` and `F` are vectors). And it is true in scalar form too, when `a` and `F` are the magnitudes of acceleration and force.
Now we can easily find the magnitude of the resultant force:
`F=ma=6.2*1.6` = 9.92 (N). This is the answer.
Newton (N) is the unit for force in SI. And yes, `N=kg*m*s^(-2).`