<span>A qualified term is something that be true, assuming other conditions are also met. For example, the right to free speech is a qualified right. You do have a right to free speech, provided that you aren’t breaking any conditions such as slander, obscenity, or plagiarism.</span>
It is true, because some is not an absolute term. The distinction between absolute and qualified terms is about the purposes, where absolute shows limitations and restraint for the given topic. For example, <em>The stars can only be seen at nights</em> - It is an example of absolute quality. We have a strict restraint here that the stars can only be seen at night time. But <em>Some frog species only have one leg </em>is an example of qualified term - In this sentence we show that there are other species, as well which we are not discussing.
The problem of distance, trajectory, and accuracy. More so, he is trying to also solve the issue of his combustion chamber that makes his rocket explode.