A) 36 cm/s
B) 9 cm/s
C) 4.5 cm/s
D) 18 cm/s
Correct Answer: D
Solution :
Velocity is defined as rate of change of displacement. \[\therefore \] \[v=\frac{dx}{dt}\] Given, \[x=a+b{{t}^{2}}\] Differentiating w.r.t. t, we get \[v=\frac{dx}{dt}=2\,bt\] Given, b = 3 \[cm/{{s}^{2}}\], t = 3 s. \[\therefore \] \[v=2\times 3\times 3=18\,\,cm/s\]You need to login to perform this action.
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