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A particle of mass \(m\) is launched with an initial velocity of \(\Vect{v}(0) = \begin{pmatrix} 20 \\ 30 \end{pmatrix}\) m/s. The only force acting on it is gravity, which results in a constant acceleration of \(\Vect{a} = \begin{pmatrix} 0 \\ -9.8 \end{pmatrix}\) m/s².
Find the velocity vector \(\Vect{v}(t)\) of the particle at time \(t\).
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