Answer
40 ft
Work Step by Step
We know that if point $P$ is a point on a circle of radius $r$, and $P$ moves in a distance $s$ on the circumference of the circle in an amount of time $t$, then the linear velocity, $v$, of $P$ is calculated as $v=\frac{s}{t}$.
As a result, we also know that $s=vt$.
We are given that $v=10$ ft/sec and $t=4$ sec.
Therefore, $s=(10 ft/sec)(4 sec)=40$ ft.