What elongation range defines Medium elongation for kernmantle rope?

• A. Less than 5 percent
• B. 5 to 10 percent
• C. Greater than 10 percent
• D. 10 to 20 percent

Answer: (B)

Elongation is how much a kernmantle rope stretches under load, expressed as a percentage of its original length. Ropes used in rescue are often categorized as low, medium, or high elongation to describe their energy absorption and how much they will lengthen when loaded. Medium elongation sits in the middle, meaning the rope will stretch a moderate amount—roughly 5 to 10 percent of its length—under the specified load. This range provides a balance: enough stretch to absorb some energy and reduce impact forces, but not so much that the rope becomes overly long or difficult to manage. Less than 5 percent is considered low elongation (stiffer with less give), and more than 10 percent is high elongation (more stretch, which can complicate control and timing in certain operations). So the 5–10 percent range is the best match for a medium elongation classification.