Forces and elasticity scenario: speed changes over a measured time interval. Which answer best addresses Required practical: force and extension and the objective to describe how to measure the original length of a spring before adding loads?

The correct answer is: In the athlete sprint scenario, apply spring to describe how to measure the original length of a spring before adding loads while keeping elastic versus plastic deformation separate.

The correct option is In the athlete sprint scenario, apply spring to describe how to measure the original length of a spring before adding loads while keeping elastic versus plastic deformation separate.. It is correct because the scenario says speed changes over a measured time interval, which must be interpreted through Required practical: force and extension. This directly supports the learning objective to describe how to measure the original length of a spring before adding loads. Use values 2, 15, and 16 only if the question asks for a calculation. The answer earns credit by naming the relevant force or motion quantity, using units when needed, and avoiding the boundary error elastic versus plastic deformation.