A) \[a+2bt\]
B) \[2b+6ct\]
C) \[2b-6ct\]
D) \[3b-6c{{t}^{2}}\]
Correct Answer: C
Solution :
\[x=at+b{{t}^{2}}-c{{t}^{3}},\ a=\frac{{{d}^{2}}x}{d{{t}^{2}}}=2b-6ct\]
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