Two children drop water balloons from a bridge, as shown in the picture drawn to scale below. The balloons were released from rest at the height of the top railing. Each water balloon is about 30 cm in diameter. In this figure, one of the balloons is about 1.8 m below the top railing of the bridge.
(a) Which balloon is 1.8 m below the top railing? Justify your choice.
(b) How much time after the first child dropped her balloon did the second child drop her balloon? Take measurements directly from the figure and scale appropriately. Explain all calculations, and how you determined all values in those calculations.
