A coin is tossed vertically upward from the edge of a platform that is 5m above the ground with an initial speed of 14ms−1. Take g=9.8ms−2.
(i) Calculate the time taken for the coin to return to the level of the platform.
(ii) After passing the platform on its way down, how much additional time does it take to hit the ground 5m below?
(iii) Find the total time from the instant of projection until the coin reaches the ground.