Hello!
Data:
F (force) = 22.0 N
m (mass) = ? (in Kg)
a (acceleration) = 5.5 m/s²
We apply the data to the Resultant Force formula, we have:
[tex]F =m*a[/tex]
[tex]22 = m*5.5[/tex]
[tex]5.5 m = 22[/tex]
[tex]m = \dfrac{22}{5.5} [/tex]
[tex]\boxed{\boxed{m = 4\:Kg}}\end{array}}\qquad\checkmark[/tex]
I hope this helps. =)