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$$
\Rightarrow \left\{\begin{matrix}
x=0 & & \\
v>0 & &
\end{matrix}\right.\leftrightarrow \left\{\begin{matrix}
0=cos\varphi & & \\
v=-\frac{25\pi }{4}sin\varphi >0
& &
\end{matrix}\right.\Rightarrow \varphi =-\frac{\pi }{2}$$
 
$
\Rightarrow \left\{\begin{matrix}
x=0 & & \\
v>0 & &
\end{matrix}\right.\leftrightarrow \left\{\begin{matrix}
0= \cos\varphi & & \\
v=-\dfrac{25\pi }{4} \sin\varphi >0
& &
\end{matrix}\right.\Rightarrow \varphi =-\dfrac{\pi }{2}$
 
$$N=\dfrac{a \left(3+ \dfrac{2}{2 \sqrt{a}-\sqrt{b}} \right)+ b \left(3+ \dfrac{2}{2 \sqrt{b}-\sqrt{a}} \right)+2 \sqrt{c} \left( 3 \sqrt{c}+ \sqrt{2}\right)+5}{2 \sqrt[4] {ab}+ \sqrt{2c}+1}.$$
 

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