Physics C: Mechanics

An object starts from rest and moves along a straight track. For the first 8.0 s of the object's motion, the acceleration is modeled by $a(t)=\beta t^2$⁠, where $\beta=\frac{3}{64}\ \text{m/s}^4$⁠. What is the object's speed at $t=8.0\ \text{s}$⁠?