I hate physics! help me in this 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?

I hate physics! help me in this question?
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
Reply:I'm sure physics hates you too.

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