At what speed should you swing it so its acceleration will be 9.8 m/s^2?
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acceleration of the stone a = v^2 / L , where 'v' is its speed
so that v = square root of ( a L ) = square root of ( 9.8 x0.65) = 2.252 m/sec
so that v = square root of ( a L ) = square root of ( 9.8 x0.65) = 2.252 m/sec