An object experiences an acceleration of magnitude $3.75 m/s^2$. Calculat the mass of the object given there are three forces acting on an object as follows:

Question

$\overrightarrow{F1} = (-2\overrightarrow{i}+ 2\overrightarrow{j})\; N$
$\overrightarrow{F2} = (5\overrightarrow{i}-3\overrightarrow{j})\; N$
$\overrightarrow{F3} = (-45\overrightarrow{i})\; N$