A) 3 6 cm/sec
B) 9 cm/sec
C) 4.5 cm/sec
D) 18 cm/sec
Correct Answer: D
Solution :
[d] \[x=a+b{{t}^{2}}=15+3{{t}^{2}}\] \[v=\frac{dx}{dt}=3\times 2t=6t\] \[\Rightarrow \]\[v{{|}_{t=3s}}=6\times 3=18cm/s\]You need to login to perform this action.
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