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A particle is kept fixed on a turn table...

A particle is kept fixed on a turn table rotating uniformly. As seen from the ground , the particle goes in a circle , its speed is 20 cm/s and acceleration 20 cm/s^2`. The particle is now shifted to make radius half of the original value. The new values of speed and acceleration will be

A

`10 cm/s , 10 cm/s^2`

B

`10cm/s, 80cm / s^2`

C

`40 cm/s, 10 cm/s^2`

D

`40cm/s, 40cm /s^2`

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