The position \( x \) of a particle varies with time \( (t) \) as \(...

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The position \( x \) of a particle varies with time \( (t) \) as \( x= \)
P \( a t^{2}-b t^{3} \). The acceleration at time \( t \) of the particle will

W be equal to zero, where \( t \) is equal to:
(1) \( \frac{2 a}{3 b} \)
(2) \( \frac{a}{b} \)
(3) \( \frac{a}{3 b} \)
(4) Zero
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