Two Ways to Stop the Same Ball

A fictional biomechanics worksheet describes two catches of a two-kilogram training ball moving horizontally at ten metres per second. In both supplied trials the ball ends at rest without bouncing, and the worksheet ignores gravity and other horizontal forces during the stopping interval. The average stopping interval is 0.10 seconds in the first trial and 0.20 seconds in the second. The teacher asks learners to compare changes in momentum, average net force and what cannot be inferred. A learner claims the second trial requires only half the impulse because the catch takes longer. Another claims an average-force calculation proves the second technique cannot cause injury. The class must use the explicit model and units while separating a mechanical comparison from an unsupported health conclusion.