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A particle osciallates with SHM accordin...

A particle osciallates with SHM according to the equation `x= (2.5 m ) cos [ ( 2pi t ) + (pi)/(4)]` . Its speed at `t = 1.5 ` s is

A

`11.1 ms^(-1)`

B

`22.2 ms^(-1)`

C

`33.3ms^(-1)`

D

` 44.4 ms^(-1)`

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