Here is my question.

The function $\displaystyle v(t)=15\cos{3t}$, $\displaystyle 0 \leq t \leq 2 \pi$, is the velocity in m/sec of a particle moving along the x-axis. Complete parts (a) through (c).

a.Graph the velocity function over the given interval. then determine when the motion is in the positive direction and when it is in the negative direction.

(I have done this part)

b.Find the displacement over the given interval.

(I have done this part)

c.Find the distance traveled over the given interval.

(This is the part that I am fuzzy on)

For this, does it involve previously found information? Or is it a separate set of calculations all its own?

Any help is appreciated!