A particle is kept fixed on a turntable rotating uniformly. As seen from the ground the particle goes in a circle, its speed is 20 cm/s and acceleration is 20 cm/s 2. The particle is now shifted to a new position to make the radius half of the original value. The new values of the speed and acceleration will be
(a) 10 cm/s, 10 cm/s 2 (b) 10 cm/s, 80 cm/s 2 (c) 40 cm/s, 10 cm/s 2 (d) 40 cm/s, 40 cm/s 2.
