# An object with a mass of 3 kg is acted on by two forces. The first is F_1= < -2 N , -5 N> and the second is F_2 = < 7 N, 1 N>. What is the object's rate and direction of acceleration?

The resultant force is given as F = F_1+F_2 = <(-2+7)N,(-5+1)N> = <5N,-4N>
I do not understand the "rate of acceleration" part, but the magnitude of the acceleration is: $\frac{\sqrt{{5}^{2} + {4}^{2}}}{3} m {s}^{-} 2 = \frac{\sqrt{41}}{3} m {s}^{-} 2$
$\theta = {\tan}^{-} 1 \left(- \frac{4}{5}\right)$