[tex]\displaystyle\bf\\S(t)=\frac{1}{3}t^{3} -2t^{2}+3\\\\\\V(t)=S'(t)=\frac{1}{3} \cdot(t^{3} )'-2\cdot(t^{2} )'+3'=\frac{1}{3} \cdot3t^{2} -2\cdot 2t+0=\\\\\\=t^{2} -4t\\\\\\a(t)=V'(t)=(t^{2} )'-4\cdot t'=2t-4\\\\\\a(3)=2\cdot 3-4=6-4=2\\\\\\Otvet \ : \ a(3)=2[/tex]
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[tex]\displaystyle\bf\\S(t)=\frac{1}{3}t^{3} -2t^{2}+3\\\\\\V(t)=S'(t)=\frac{1}{3} \cdot(t^{3} )'-2\cdot(t^{2} )'+3'=\frac{1}{3} \cdot3t^{2} -2\cdot 2t+0=\\\\\\=t^{2} -4t\\\\\\a(t)=V'(t)=(t^{2} )'-4\cdot t'=2t-4\\\\\\a(3)=2\cdot 3-4=6-4=2\\\\\\Otvet \ : \ a(3)=2[/tex]