Final answer:
The speed of the water as it exits the shower-head openings would be the same as the speed in the pipe.
Step-by-step explanation:
The speed of water as it exits the shower-head openings depends on the design of the shower-head and the pressure of the water. However, assuming an ideal situation where the water is flowing smoothly and there is no constriction, the speed of the water as it exits the shower-head openings would be the same as the speed in the pipe, which is 3.0 m/s.