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A point mass moves along a circle of rad...

A point mass moves along a circle of radius `R` with a constant angular acceleration `alpha`. How much time is needed after motion begins for the radial acceleration of the point mass to be equal to its tangential acceleration ?

A

`sqrt((1)/(alpha))`

B

`sqrt((R)/(alpha))`

C

`sqrt((2)/(alpha))`

D

`sqrt((1)/(2alpha))`

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The correct Answer is:
A
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