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The tangenital acceleration of a particl...

The tangenital acceleration of a particle in a circular motion of radius 2 m is `a_(t)=alphat m//s^(2)` (where `alpha` is a constant) initially the particle as rest. Total acceleration of the particle makes `45^(@)` with the radial acceleration after 2 sec The value of constant `alpha` is :

A

`1/2 m//s^(3)`

B

`1 m//s^(3)`

C

`2 m//s^(3)`

D

Data are insufficient

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The correct Answer is:
B
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