I hate physics! help me in this question?

Question

Romeo is chucking pebbles gently up to Juliet’s
window, and he wants the pebbles to hit the window with
only a horizontal component of velocity. He is standing at
the edge of a rose garden 4.5 m below her window and 5.0 m
from the base of the wall ( as in the lower Fig). How fast are
the pebbles going when they hit her window?

Answer 1

He wants to hit with horizontal velocity therefre verticl velocity -0

Angle Theta = Tan^-1(5/4.5)
Theta = 48.01.

Intialvelocity =U
Vertical velocity =Usin(theta)
Horizontal veloity=Ucos(theta)

Ucos(theta)XT=4.5
0=2(-9.8)(5.0)+(Usin(theta))^2
U=13.32ms^-1

13.32cos48.0 = speed
= 8.9ms^-1

Answer 2

If Romeo is more worried about the velocity of his pebbles, he should go and get a proper life.

In any case the answer is 'any speed you want except zero, unless the window is not vertical in which case it can be any speed at all'