Step-by-step explanation:
to find u
[tex]cos45 = \frac{y}{20 \sqrt{2} } \\ y = cos45 \times 20 \sqrt{2 } \\ y = 20[/tex]
[tex] {(20 \sqrt{2} )}^{2} - {20}^{2} \\ 800 - 400 = 400 \\ {x}^{2} = 400 \\ x = 20[/tex]
