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If a particle moves with velocity $v (t) = 2 t^{2} - t m / s$ , then find the velocity ( $m / s$ ) of particle at $t = 3 s$ .

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Solution

$v (t) = 2 t^{2} - t$
$t = 3 s$
$v (3) = 2 \times (3)^{2} - (3) = 15 m / s$

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