These two problems confuse me and I am not sure how to start the problem

An arrow is; shot from a height of 1.5 m toward a cliff of height H. It is; shot with a velocity of '1? m.I"5 at an angle of ED\" above the horizontal. It lands on the top edge of the cliff 4.1 5 later. a} What is the height of the cliff (in m}? ITI b] What is; the maximum height from the bottom of the cliff reached by the arrow along its trajectory? m c} What is the arrow's impact speed {in mic} juat before hitting the cliff! A ball is thrown horizontally from the top of a 68.8 m building and lands 109.8 m from the base of the building. Ignore air resistance. (Assume the ball is thrown in the +x direction. Choose up to be +y direction from the top of the building.) a) How long (in s) is the ball in the air? b) What must have been the initial horizontal component of the velocity (in m/s)? (Indicate the direction of with the sign of your answer.) m/s c) What must have been the vertical component of the velocity (in m/s)just before the ball hits the ground ? (Indicate the direction of with the sign of your answer.) m/s d) What is the final velocity vector in (m/s) of the ball just before it hits the ground? magnitude m/s direction degrees from +x direction (include the sign of the angle)