A) 3
B) - 2
C) - 3
D) 2
Correct Answer: C
Solution :
We have \[s={{t}^{3}}-3{{t}^{2}}\] On differentiating w.r. to t, we get \[\frac{ds}{dt}=3\,{{t}^{2}}-6t\] ?. (i) Again, differentiating equation (i), we get \[\frac{{{d}^{2}}s}{d{{t}^{2}}}=6t-6=0\] \[\Rightarrow \] \[t=1\] On put the value of t = 1 in equation (i) we get, \[\frac{ds}{dt}=3\times 1-6\times 1\] \[=3-6\] \[=-3\text{ }m/sec\]You need to login to perform this action.
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