1) The acceleration of gravity is 9.8 m/s2 on Earth, causing all objects in free fall to accelerate at this rate. 2) The equations for calculating velocity (V=gt) and distance (Distance=1/2gt2) in free fall problems are provided. 3) Terminal velocity is reached when the downward force of gravity equals the upward force of air resistance, and it depends on an object's mass and surface area.