Tangental acceleration of a particle mov...

Tangental acceleration of a particle moving in a circle of radius 1 m varies with time t as shown in figure (initial velocity of the particle is zero). Time after which total acceleration of particle makes an angle of `30^(@)` with radial acceleration is

4 s

`(4)/(3)s`

`2^((2//3))s`

`sqrt2s`

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