Solving Ball Hitting Ramp Physics Problem

[DrKn]

http://img384.imageshack.us/img384/5267/physicsproblem3aq.jpg

This is my problem.


I called the angle between ramp and horizontal theta.

Then, i formed a rectangle between V0 and the ramp, and found the angle between the ramp and V0 is also theta.


Then, i repositioned my coordinate system, so that the x-axis is parallel to the ramp's hypotenuse.


Then, i modeled:
(delta) x = V0cos(theta)* t + 1/2 g sin(theta) * t^2
(delta) y = V0sin(theta) * t + 1/2 g cos(theta) * t^2

and i plugged it into the pythagorean theorem.

when i solved for theta, i don't get a pure number, so i know its wrong.

need major help

 

[HallsofIvy]

How did you "plut it into the pythagorean theorem"? What right triangle did you use? What is the hypotenuse, legs?

 

[DrKn]

the triangle legs was delta x and delta y, and the range was the hypotenuse