Stone A is thrown vertically upward with an initial speed of 14 m/s. Stone B is thrown from the same point 0.5 s later with an initial speed of 19 m/s.
(i) Find the time after Stone A is thrown when each stone reaches its highest point.
(ii) Calculate the maximum height reached by each stone.
(iii) Which stone remains in the air for a longer total time before returning to the launch level, and by how much?
Take g = 9.8 m/s².