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${\frac {d{\boldsymbol {v}}(t)}{d{\mathit {t}}}}={\boldsymbol {a}}(t)$

${\boldsymbol {v}}(t)={\boldsymbol {v}}(t_{0})+$

${\boldsymbol {v}}=\int {\boldsymbol {a}}\ d{\mathit {t}}.$