Using equation of motion in y-dir $s=ut+\frac{1}{2}a{t}^2$

Height after $2 \mathrm{s}$,

$h=5=\left(\text{50 sin}\text{θ}\right)t-\frac{1}{2}g{\left(t\right)}^2$

$5=\left(\text{50 sin}\text{θ}\right)\left(2\right)-\frac{1}{2}·\text{10}·{\left(2\right)}^2$

$\frac{\text{25}}{\text{100}}=\text{sin}\text{θ}$

$\text{sin}\text{θ}=\frac{1}{4}$

$\text{55 sinθ}=\frac{55}{4}=13.75$