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## Homework Statement

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

## Homework Equations

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.