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Centripetal acceleration = V2/R = (4)2/(0.5) = 32 meters/sec2

The centripetal acceleration doesn't depend on the stone's mass.

(The centripetal force does.)

The centripetal acceleration doesn't "act on" the stone.

(The centripetal force does.)

The centripetal force acting on the stone is F = M A = (0.25) (32) = 8 newtons.

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