Respuesta :

[tex]s = ut + \frac{1}{2} at ^{2} [/tex]

[tex]s = \frac{1}{2} at^{2} [/tex]
[tex]t ^{2} = \frac{2s}{a} [/tex]
[tex]t = \sqrt \frac{2s}{a} [/tex]

Hope this helps you :)