S(t)=-t³+3t²+9t+3
V(t)=S'(t)=-3t²+6t+9
V(2)=-12+12+9=9 м/с
a(t)=V'(t)=-6t+6
a(2)=-12+6=-6 м/с².
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S(t)=-t³+3t²+9t+3
V(t)=S'(t)=-3t²+6t+9
V(2)=-12+12+9=9 м/с
a(t)=V'(t)=-6t+6
a(2)=-12+6=-6 м/с².