An iron ball is released from rest at the top of a vertical cliff. While falling, it passes a ledge with a speed of 18m/s. Ignore air resistance and take g=9.8m/s2.
(i) Calculate the vertical distance between the top of the cliff and the ledge.
(ii) How much further must the ball fall from the ledge for its speed to reach 30m/s?
(iii) If the ball finally strikes the ground with a speed of 40m/s, determine the total height of the cliff.