4. If you take physics in grade 11, you will use a variety of formulas that you will have to be comfortable with rearranging. One of those formulas is $d = vt + \frac{1}{2}at^2$, where d is the distance in metres, v is the speed in m/s, t is the time in seconds, and a is the acceleration in m/s². Rearrange this formula and solve for a.