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A particle moving in a straight line sta...

A particle moving in a straight line starts from rest and the acceleration at any time t is `a- kt^(2)` where a and k are positive constants. The maximum velocity attained by the particle is

A

`(2)/(3) sqrt(a^(3)//k)`

B

`(1)/(3) sqrt(a^(3)//k)`

C

`sqrt(a^(3)//k)`

D

`2 sqrt(a^(3)//k)`

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