using A=theta

Equation 1

\(\displaystyle 2usinA-2g=0\)

\(\displaystyle u=\frac{2g}{2sinA}\)

Equation 2

\(\displaystyle 4ucosA=200\)

Sub 1 in 2

\(\displaystyle 4*\frac{2g}{2sinA}cosA=200\)

\(\displaystyle tanA=\frac{8g}{400}\)

then \(\displaystyle A=11.1\)

and \(\displaystyle u=50.95ms^{-1}\)

is everything correct?

thanks for your help!