gaining momentum

in cheerelading the amount of force the base exerts on the flyer determines the speed of the flyer going up in the air. The momentum must be great in order for the stunt to work. The change in momentum is equal to the impulse of the flyer therefore as the flyer rises she gains momentum and at the peak of the flyers distance it comes to a complete stop in accelleration before it continues its bath back toward the bases on the ground. That decrease in momentum to 0 is the first part of the flyers path.On her way down she is increasing in momentum which makes the impulse greater. At full force she comes down on the bases arms where they must cath her to prevent her from feeling the imact of the ground. this is why bases must be strong in order to work as that protection.