Consider a particle whose position vector is given by thevec$(r)(t)=$Acos$(t)hat(y).$

following expression: ~r$($t$)=$ Acos$($wt$)($y cap$)$

$($y cap is the vector $)$

Q$2$a: Describe in one sentence the motion of this particle in plain English.

$$ Q$2$b: What is this motion called?