Final answer:
The degree of the block determines the magnitude and direction of the velocity of the block/bullet combination immediately after the impact. The location of the block determines the magnitude and direction of the impulse by the block on the bullet.
Step-by-step explanation:
In the context of medical or physiological discussions, particularly related to nerve conduction or cardiac issues, the completion to the provided statement would be:
"The degree of the block is key to determining the degree of the block. The location of the block is key to determining the location of the block."
It seems there might be an error or confusion in the question, as the completion provided does not offer specific information or terms related to determining the degree or location of a block. Normally, in medical contexts such as nerve conduction studies or cardiac conduction issues, determining the degree of a block (partial or complete) and its location are crucial for diagnosis and treatment