4. A projectile is fired at an angle from the top of a cliff as shown in the diagram below. A graph is created of the projectile's vertical motion while it is in the air and is shown here. a. (2) Use the graph to calculate the height, h, of the cliff. Velocity (ms) 50 40 30 20 10 -10 -20 -30 -40 -50 0 HALVA 1 41249) (40)=80 Time (s) 12bh - 1/2(5)(-50) = -125 b. (2)The horizontal range of the projectile was 270m. On the graph above, draw a dashed line that represents the horizontal motion of the projectile. c. (1) Calculate the launch velocity of the projectile. d. (1)Calculate the velocity of the projectile just before it lands. e. (2) If a second, identical projectile was launched at the same velocity you calculated in part c but at a slightly lower angle, would the velocity of the projectile just before it lands be greater less than equal to your answer to part d? Justify your reasoning using physics concepts.