Stone A is thrown vertically upwards with a speed of 10 m-s from the edge of the roof of a 40 m high building, as shown in the diagram. Ignore the effects of air friction. Take the ground as reference. 15.1 15.2 15.3 Define the term free fall. Calculate the maximum HEIGHT ABOVE THE GROUND reached by stone A. Write down the magnitude and direction of the acceleration of stone A at this maximum height. Stone B is dropped from rest from the edge of the roof, x seconds after stone A was thrown upwards. 15.4 Stone A passes stone B when the two stones are 29,74 m above the ground. Calculate the value of x. 40 m 10 m-s