Answer:

Step-by-step explanation:
The average velocity of a moving object is given by:

where
d is the displacement of the object
t is the time taken
In this problem, we have
d = 25 m is the displacement
t = 2 s is the time
Therefore, the average velocity of the seagull is

Note that velocity is a vector, so it has not only a magnitude, but also a direction, which corresponds to the direction of the displacement (downward, in this example).