While riding in a hot air balloon, which is steadily descending at a speed of 2.88 m/s, you accidentally drop your cell phone.
(a) After 4.00 s, what is the speed of the cell phone?
(b) How far is the cell phone below the balloon after this time?
(c) What are your answers to parts (a) and (b) if the balloon is rising steadily at 2.88 m/s?