Technician A says that a driveshaft with U-joints speeds up and slows down once per rotation.Technician B says that to avoid torsional vibrations,the rear U-joint needs to cancel out the non-uniform rotation of the forward U-joint.Who is correct?

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The Answer of Technician A says that a driveshaft with U-joints speeds up and slows down once per rotation.Technician B says that to avoid torsional vibrations,the rear U-joint needs to cancel out the non-uniform rotation of the forward U-joint.Who is correct?

Technician a Says That a Driveshaft with U-Joints Speeds Up