Given:
The acceleration of the dolphin is

The time taken by the dolphin is

The velocity of the dolphin at the end is

Required: the displacement of the dolphin
Explanation:
The displacement of the dolphin can be calculated by the third equation of motion. that is given by

we assume that the initial velocity of the dolphin is zero u=0.
plugging all the values in the above equation, we get

Thus, the displacement of the dolphin is
