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[" A sphere of radius "10cm" and mass "25kg" is attached to the lower end of a steel wire of length "5m],[" and diameter "4mm" which is suspended from the celling of a room.The point of support is "521cm],[" above the floor.When the sphere is set swinging as a simple pendulum,its lowest point just "],[" grazes the floor.Calculate the velocity of the ball at its lowest position ( "Y_(" steel ")=2times10^(11)N/m^(2)" ) "]

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