A stone tied to the end of a string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolution in 44 seconds, what is the magnitude and direction of acceleration of the stone-

1. A. 2 ms -2 and direction along the tangent to the circle
2. B. 2 ms -2 and direction along the radius towards the centre.
3. C. 2 4 ms -2 and direction along the radius towards the centre.
4. D. 2 ms -2 and direction along the radius away from the centre.

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