If A Beach Ball With A Mass Of 0 08 Kg Is Thrown Vertically Upward In A Vacuum S

if a beach ball with a mass of 0.08 kg is thrown vertically upward in a vacuum so there is no drag force on it, it reaches a height of 10 meters. if the ball is thrown upward with the same initial velocity but in air instead of a vacuum, it reaches a height of 8.4 meters. what is the drag force (assuming that is constant) on the ball during the motion of the ball?