$\begin{array}{1 1}400m,100m\\200m,100m\\400m,200m\\200m,200m\end{array} $

The velocity will be minimum at the highest point.

So,x-co-ordinate is $\large\frac{400}{2}$ m ,i.e.,200m

Again,$y=h_{max}=\large\frac{v^2\sin^245^{\large\circ}}{2g}$

$\Rightarrow \large\frac{v^2}{4g}$

$\Rightarrow \large\frac{1}{4}$$\times 400m=100m$

How can you say that x coordinate is half of 400 ? Why it is half please give the reason

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