1. The problem statement, all variables and given/known data An object is travelling along a curved path. At a particular instant the angle between its velocity vector and its acceleration vector is 128 degrees. The magnitude of its acceleration vector is 6.68 m/s2. At that instant, what is the particle's rate of change of speed? (in m/s2) Pick one: a. 6.68 b. -6.68 c. -4.11 d. 4.11 e. -5.26 f. 5.26 2. Relevant equations I am not sure which equation to use. That is where I am stuck. No equation I can think of helps me. 3. The attempt at a solution Created a triangle, one side is the acceleration, the other is velocity. They are bound by a 128° angle. Not sure how to carry on from this point; help needed.