Number 7 and number 8 part a and b show all work step

7) A ball thrown at 20.0 m/s at angle @ below the horizontal from a cliff of height H lands 69.0 m from the base 4.00 s later. Find O and H. 8) (a) An object is launched from ground level with an initial velocity vo at angle O above the horizontal. Show that the maximum height H is given by (vo sin 0)2 H = 2g (b) A ball is kicked with an initial angle of 30 and just barely clears a 2.75 m fence. What was the initial speed of the ball