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)
I am not sure which equation to use. That is where I am stuck. No equation I can think of helps me.
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.