A) \[\frac{a}{b}\]
B) \[7.5\ km/h\]
C) \[\frac{a}{3b}\]
D) Zero
Correct Answer: C
Solution :
\[\frac{dx}{dt}=2at-3b{{t}^{2}}\Rightarrow \frac{{{d}^{2}}x}{d{{t}^{2}}}=2a-6bt=0\Rightarrow t=\frac{a}{3b}\]
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