A $4\mathrm{.}0-kg$ particle moving along the x $-$axis is acted upon by the force that is also directed along the $x-$axis and whose functional form appears in the graph below. When the particle is at the point $x=0,$ its velocity is $v=6\mathrm{.}0\frac{m}{s}.$ Find the particle's velocity when it reaches the point $x=10\mathrm{.}0m.$

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