A very large number of balls are thrown vertically upward in quick succession in such a way that the next ball is thrown when the previous one is at the maximum height. What is the purpose of throwing the balls in this manner?
1) To test the maximum height that can be achieved by the balls
2) To observe the time taken for each ball to reach the maximum height
3) To study the effect of air resistance on the motion of the balls
4) To calculate the velocity of each ball at the maximum height