A dog chases a skateboarder travelling at 10.4 m s 10.4 s m 10, point, 4, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. The skateboarder speeds up with a constant acceleration for 39 m 39m39, start text, m, end text over 3.3 s 3.3s3, point, 3, start text, s, end text. We want to find the acceleration of the skateboarder over the 3.3 s 3.3s3, point, 3, start text, s, end text time interval. Which kinematic formula would be most useful to solve for the target unknown?