Displacement is zero. That’s because she ended up where she started.
1.53 m/s toward the beach
Explanation:
The magnitude of the velocity of the runner is given by:
![v=\frac{d}{t}](https://tex.z-dn.net/?f=v%3D%5Cfrac%7Bd%7D%7Bt%7D)
where
d is the displacement of the runner
t is the time taken
In this case, d=110 m and t=72 s, so the velocity of the runner is
![v=\frac{110 m}{72 s}=1.53 m/s](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B110%20m%7D%7B72%20s%7D%3D1.53%20m%2Fs)
Velocity is a vector, so it consists of both magnitude and direction: we already calculate the magnitude, while the direction is given by the problem, toward the beach.