A) \[-3\,m{{s}^{-1}}\]
B) \[4\,m{{s}^{-1}}\]
C) \[-16\,m{{s}^{-1}}\]
D) \[-12\,m{{s}^{-1}}\]
Correct Answer: A
Solution :
[a] At \[t=0,\,x=0\] At \[t=4,\,x=9\times 4-3{{(4)}^{2}}=36-48=-12\,m\] So the average velocity \[=-\frac{12}{4}=-3\,m{{s}^{-1}}\]
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