An experiment is designed to test the relationship between the initial height of a basketball before it dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball

in the above experiment, which condition would not be controlled

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.