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-1/2(-9.81)*(x/(v*cos(30)))^2+sin(30)/(cos(30))*x+y1=0, x=16.5, v=6 solve for y1
-1/2(-9.81)*(x/(v*cos(30)))^2+sin(30)/(cos(30))*x+y1=0, x=16.5, v=6 solve for y1
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