the ball with lead pellets will have a stronger graviational force. The balls fall accelerating until air resistance is equal to the graviational force. Therefore, the unfilled ball reaches its terminal speed first, and the leaded ball keeps accelearting until air resistance equals its weight.
The greater speed of the leaded ball at terminal velocity means it is encountering more air resistance. The leaded ball hits first, it accelerated longer, and had the higher terminal velocity.
If you simultaneously drop a pair of tennis balls from the top of a building, they strike the ground at the same time. If one of the tennis balls is filled with lead pellets, will it fall faster and hit the ground first? Which of the two will encounter more air resistance?
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