Final answer:
The question seems to involve gymnastics and physics, focusing on the conservation of angular momentum and kinematics equations, but does not clearly specify the grip for the Leg Tuck event. Common grips in gymnastics could involve a neutral or alternating grip.
Step-by-step explanation:
The grip used during the Leg Tuck event is not specified in the provided information. However, the mention of a gymnast dismounting from a high bar in a tucked position suggests that the question may be asking about techniques related to gymnastics, and not specifically the Leg Tuck event. The provided information discusses the application of the conservation of angular momentum and the use of kinematics equations to calculate the gymnast's rotation rate and the number of revolutions during a dismount. These concepts are crucial for understanding motion in gymnastics and physics in general. Nevertheless, if this were referring directly to the actual Leg Tuck event, typically a neutral grip or an alternating grip is used wherein the palms face inward towards each other or one palm faces away and one palm faces towards the gymnast respectively.