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

In a circular motion of a particle the tangential acceleration of the particle is given by `a_(t) = 2t m//s^(2)`. The radius of the circle described is `4m`. The particle is initially at rest. Time after which total acceleration of the particle makes `45^(@)` with radial acceleration is :

A

1 sec

B

2 sec

C

3 sec

D

4 sec

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The correct Answer is:
b
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