$\begin{array}{1 1}\large\frac{1}{2}\normalsize m\large\frac{v}{t_1}\normalsize t^2\\ m\large\frac{v}{t_1}\normalsize t^2\\\large\frac{1}{2}\big(\frac{mv}{t_1}\big)^2\normalsize t^2\\\large\frac{1}{2}\normalsize m\large\frac{v^2}{t_1^2}\normalsize t^2\end{array} $