v(t) = x'(t) = (2t^3 - t^2)' = 6t^2 - 2t
v(4) = 6 × 16 - 2 × 4 = 96 - 8 = 88 м/с
a(t) = v'(t) = (6t^2 - 2t)' = 12t - 2
a(4) = 48 - 2 = 46 м/с^2
Ответ : 88 м/с, 46 м/с^2
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v(t) = x'(t) = (2t^3 - t^2)' = 6t^2 - 2t
v(4) = 6 × 16 - 2 × 4 = 96 - 8 = 88 м/с
a(t) = v'(t) = (6t^2 - 2t)' = 12t - 2
a(4) = 48 - 2 = 46 м/с^2
Ответ : 88 м/с, 46 м/с^2