I came across a question involving an archer fish and an insect that has me puzled. The question gives that an archer fish spots an insect dangling on a branch of a tree. The fish can attack by spitting water at it's prey. But it just so happens that just as this fish spits out the water, the insect is startled and drops from the branch. Now the question is what happens to the water that was spat out?..does it miss the insect?, or does it hit regardless?. The answer given was that it hits the insect regardless of the drop. I do not however understand why this is so?. I have tried to come up with an equation to explain this but no luck so far. All I have so far is that there is an object (the insect) that is falling at a constant rate of g, another object (the water from the fish) travelling towards it with a speed v and the fact that at time t the two objects collide. Is there any way to show this through an equation?