If s = t- 4t2 + 5 describes the motion of a particle, then its velocity (in unit/sec) when the acceleration vanishes, is

1
\(\frac{ 16 }{ 9 }\)
2
\(-\frac{ 32 }{ 3 }\)
3
\(\frac{ 4 }{ 3 }\)
4
\(\frac{ -16 }{ 3 }\)

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