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Figure shows a sine curve, as the displa...

Figure shows a sine curve, as the displacement time curve of a particle executing rectilinear motion having equation `x = 45 ((pi)/(2)t)`. The velocit of particle at `t = (2)/(3)s` is

A

`pi ms^(-1)`

B

`sqrt(3)pi ms^(-1)`

C

`(pi)/(2)ms^(-1)`

D

None of these

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