Robin hood is pursuing a lackey of the sheriff of notingham. the lackey hides behind a bale of hay. robin hood fires an arrow into the hay and notes that the arrow has only penetrated half way. how much faster must the arrow be fired to go through? if the bow works like a simple spring, how much farther back must he draw the bow to do this, compared to the initial pull? 2. a 0.2 kg cannon ball is fired at an upward angle of 45° from the top of a 165 m cliff with a speed of 175 m/s.