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13. An object projected upward at an angle 0 - 30 with the horizontal has an initial speed of 20 m/'s. Acceleration due to gravity is 10 m/'s'. Determine the maximum height. 14. A ball is thrown from the top of a building with an initial speed of 8m/'s at an angle of 20 below the horizontal. The ball hits the ground 3 seconds later. a) How far from the bottom of building the ball touches the ground b) How high is the ball thrown from the place c) How long the ball reaches a height of 10 m from the place of throwing