Question

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

Answer 1

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: $d = 0.5AT^2 1 = 0.5*9.8 * t^2 1 = 4.9 t^2 t = 0.45 s$

For horizontal motion: 

$d= vt d = 3.5 * 0.45 = 1.58 m$

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