S(t) = 4t²+2t³
V(t) = S'(t) = 8t+6t²
V(3) = 24+6•9 = 24+54 = 78 м/с
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S(t) = 4t²+2t³
V(t) = S'(t) = 8t+6t²
V(3) = 24+6•9 = 24+54 = 78 м/с