A player kicks a football with an initial speed of 25 ms ^ - 1 at...

$\theta = 45 °$

$H = \dfrac{{u}^{2}\sin^{2}\theta}{2g} = \dfrac{( 25{)}^{2} \times \left(\dfrac{1}{2}\right)}{2 \times 10} = \dfrac{125}{8}\text{m}$

and time $t = \dfrac{T}{2}$

$= \dfrac{usin\theta}{g} = \dfrac{25\left(\dfrac{1}{\sqrt{2}}\right)}{10} = \dfrac{25}{10\sqrt{2}} = \dfrac{5}{2\sqrt{2}}\text{s}$