A ball is thrown vertically downward from the roof of a building 60m high with an initial speed of 5m/s. The ball is caught by a friend in a window that is 15m above the ground. Take downward direction as positive and neglect air resistance.
a. Part 1: (i) Calculate the time taken by the ball to reach the window level.
b. Part 2: (ii) Determine the speed of the ball when it reaches the window.
c. Part 3: (iii) Compute the distance travelled by the ball during the last one second of its motion before reaching the window.