A $3\mathrm{.}0$ kg object has a potential energy function along the x$-$axis given by U$($x$)=99+9$x $2$x $3$ where U is measured in Joules and x is measured in meters. $($a$)$ What is the magnitude of the object$$s acceleration at the point x $=2\mathrm{.}0$ m$?($b$)$ If the object starts from rest at x $=2\mathrm{.}0$ m$,$ what will its velocity be$$