Home / study / science / physics / physics questions and answers / terminal velocity is reached when the force of air resistance is equal to the force of gravity. question: terminal velocity is reached when the force of air resistance is equal to the force of gravity. terminal velocity is reached when the force of air resistance is equal to the force of gravity. set the radius of the ball to 0.50 m, the height to 100, and air density to 1.3 kg/m3 . click the display buttons for position, velocity and acceleration. run the simulation. now change the mass of the ball to find the highest mass that will result in a terminal velocity before the ball strikes the ground. what value did you find for this mass