Jenny and Jack throw identical balls off a tall building at the same time. The ground near the building is flat. Jenny throws her ball straight downward. Jack throws his ball downward and outward such that the angle between the initial velocity of the ball and the horizon is 30°. Jack throws the ball with a speed twice that of Jenny's ball. If air resistance is negligible, which ball hits the ground first?

Jenny and Jack throw identical balls off a tall building at the same time. The ground near the building is flat. Jenny throws her ball straight downward. Jack throws his ball downward and outward such that the angle between the initial velocity of the ball and the horizon is 30°. Jack throws the ball with a speed twice that of Jenny's ball. If air resistance is negligible, which ball hits the ground first?

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