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In a circular motion of a particle , the...

In a circular motion of a particle , the tangential acceleration of the particle is given by `a_t = 9 m s^(-2)` . The radius of the circle is 4m . The particle was initially at rest. Time after which total acceleration of the particle makes an angle of `45^@` with the radial acceleration is

A

`(1)/(3)s`

B

`(5)/(3)s`

C

`(4)/(3)s`

D

`(4)/(3)s`

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The correct Answer is:
B
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