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## Homework Statement

A ball is launched from the origin at an angle of inclination of 50 degrees above the xy plane. If the ball lands at coordinates (4,7,0), find the initial velocity of the ball.

## Homework Equations

x=(v

_{o}Cos(50)Cos(theta))t

y=(v

_{o}Cos(50)Sin(theta))t

## The Attempt at a Solution

Unfortunately, I have the answer, but I am unaware of how it was obtained.

x=.3189v

_{o}t

y=.5581v

_{o}t

z=v

_{o}sin(50)t-4.9t^2

z=0 when t=.1563

so v

_{o}=sqrt(4/(.3189)(.1563)) = 8.957m/s

Can anyone give me some insight as to how the x and y was solved for?

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