What would be it's acceleration

A particle starts moving with initial velocity $\SI{3}{\meter\per\second}$ along the x-axis from the origin. Its acceleration is varying with the $x$ coordinate according to equation $a = k x^2$ . In the a-x Graph at $x = \SI{\sqrt{3}}{\meter}$ , the tangent to the graph makes an angle $60^\circ$ with the positive x-axis. Find the acceleration (in $\si[per-mode=symbol]{\meter\per\second\squared}$ ) at $x = \SI{\sqrt{3}}{\meter}.$