If there is no clear area of 165 meters on or near the school grounds, the pendulum can be set to a shorter time period. However, if the pendulum swings too fast, it becomes more difficult to time it accurately.
If there is no clear area of 165 meters on or near the school grounds, the pendulum can be set to a shorter time period. However, if the pendulum swings too fast, it becomes more difficult to time it accurately.