kinematic problem

[Unlearner]

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"From ground level, a person at Point A throws a snowball horizontally to the right at 25 m/s. where does the snowball land? (ground level to point A is 20m. ground level to point B is 50m.) answer: at point B

__________* point A
__________
__________
__________
__________
__________
ground level_________________________* point B

my questions is how come i can't use the equation: Vf = Vi + at? can't i make the Kf = 0 and a=10 and Vi=25 and solve for time? then plug time into d=Vt. Kaplan explanation used a different equation.

 

[G1SG2]

"From ground level, a person at Point A throws a snowball horizontally to the right at 25 m/s. where does the snowball land? (ground level to point A is 20m. ground level to point B is 50m.) answer: at point B

__________* point A
__________
__________
__________
__________
__________
ground level_________________________* point B

my questions is how come i can't use the equation: Vf = Vi + at? can't i make the Kf = 0 and a=10 and Vi=25 and solve for time? then plug time into d=Vt. Kaplan explanation used a different equation.

The ball is thrown HORIZONTALLY-is no acceleration in the x direction. Vf=Vx=25 (for the horizontal velocity, only). Solve for time using y=1/2at62, then use x=vot to find the range.