I recall a study which suggested that we don't really calculate the trajectory as such, but use some kind of simple visual heuristic to continually align ourselves with where the ball is going to land.
They showed that people running to catch a ball would follow an inefficient curved path as a result of this, rather than actually calculating where the ball will land and moving there in a straight line to intercept it.
They showed that people running to catch a ball would follow an inefficient curved path as a result of this, rather than actually calculating where the ball will land and moving there in a straight line to intercept it.