[Tex/LaTex] Symbol at the end of partial answer

math-mode

How can achieve the following:

enter image description here

I would like to be able to insert a symbol at the end of partial answers. In the above image all three squares are added by me. (They do not perfectly align.)

MWE:

\documentclass[12pt,oneside]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath} 

\begin{document}

\begin{eqnarray}
v = v_0 + a \Delta t\\
\Delta s = \frac{1}{2}(v_0 + v_1)t
\end{eqnarray}

Substituting (1) in (2) gives:

\[\Delta s = v_0 + \frac{1}{2}a (\Delta t)^2\]

Eliminating $v_0$ gives:

\[\Delta s = v_1 - \frac{1}{2}a (\Delta t)^2\]

Finally, eliminating $t$ from (1) and (2) gives:

\[v_{1}^{2} - v_{0}^{2} = 2a\Delta s\]

\end{document}

Best Answer

\usepackage{amsmath}

\begin{align}
....\tag*{$\square$}\\
...\notag\\
....\tag*{$\square$}
\end{align}
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