When an object moving north experiences a 30-degree acceleration from the northwest, the reaction velocity will not simply form an obtuse angle of 90 + 30 degrees. Instead, the final velocity must be calculated by determining the change in velocity due to the acceleration, which is influenced by the duration of the acceleration. Vector addition is necessary to combine the initial velocity with the change in velocity to find the new resultant velocity. Understanding the vector components is crucial for accurate calculations. The final velocity will reflect the combined effects of both the initial motion and the acceleration applied.