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A particle of mass m moves on the x-axis...

A particle of mass m moves on the x-axis under the influence of a force of attraction towards the origin O given by `F=-(k)/(x^(2))hat(i)`. If the particle starts from rest at x = a. The speed of it will attain to reach at distance x from the origin O will be

A

`sqrt((2k)/( ma))`

B

`sqrt((k)/(ma))`

C

`sqrt((4k)/(ma))`

D

`sqrt((k)/(2ma))`

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The correct Answer is:
A
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