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The speed v of particle moving along a s...

The speed v of particle moving along a straight line, when it is at a distance x from a fixed point on the line is given by `v^2= 108 x - 9x^2`. Then magnitude of its acceleration when it is a distance 3 metre from the fixed point is

A

`9 m/s^2`

B

`18 m/s^2`

C

`27 m/s^2`

D

`36 m/s^2`

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