2) FIGURE 2 shows Adam throws a ball with an initial velocity 12 ms' at an angle of 50 to the horizontal At the same instance, his friend, Sarah throws another ball vertically upwards with an initial velocity, # at a certain distance from Adam. Determine the value of a when the two balls collide at P. (Given g = -9.81 ms") [6 marks] 12 ms 50 FIGURE 2 3) A man standing on the roof of a building throws a ball with a velocity 18.0 ms" at an angle 50" from the horizontal. The height of the building is 35.0 m. (Given