A turtle crawls along a straight line which we will call

Question

Problem: A turtle crawls along a straight line, which we will call the x-axis with the positive direction to the right. The equation for the turtle's position as a function of time is x(t)=50.0cm+(2.00cm/s)t(0.0625cm/s²)t².

Part A: What is the velocity (magnitude) of the turtle at t=6.20?

I need help to find the velocity (magnitude) of the turtle.