The velocity of a particle moving along \(x\)-axis is given by
\({v}^{2} = \alpha x-\beta{x}^{3} \)
where \(x\) is in meters and \(\alpha\) and \(\beta\) are constants.
\(v(x=2)=0 m/s\) and \(a(x=2)= - 8 m/{s}^{2}\) .
Find \(\alpha + \beta\)

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