hello :uhh: i have these questions that i don't know how or what to do :uhh: Matt drops a water ballon from a balcony 15m up. As it falls, someone calls out 2.0 s after release to warn the bystanders below. If the air temperature is 20 C and the people can move instantly, will they be able to avoid being hit? :yuck: While at the local swimming hole (pool) you fall off your flutterboard, and begin sinking to the bottom exactly 4.5m from the edge. Calculate how far you must sink below the surface in order for you to observe total internl reflection while staring at the edge. if you can show me how or the steps or any formulas involved, it would be very helpful, thanks alot!