Will isabella be able to spray ferdinand if the water is flowing out of the hose at a constant speed v0 of 3.5 meters per second? assume that the hose is pointed parallel to the ground and take the magnitude of the acceleration g due to gravity to be 9.81 meters per second, per second. hints

I've found the missing details of this task, so I can help you out:

First: keep in mind that the value of vertical motion does not depend on horizontal motion. The task asks you to figure the amount of time for a drop of water to fall 1 meter from Isabella's hand and check whether this time is enough for the water to reach the boy. 
Solution for vertical motion: 

For horizontal motion: 



Now you can see that this amount of time is not enough.