Forces and elasticity scenario: air resistance changes until terminal velocity is reached. Which answer best addresses Hooke's law and spring constant and the objective to convert extension between centimetres and metres where required?

The correct answer is: In the parachutist scenario, apply extension to convert extension between centimetres and metres where required while keeping elastic versus plastic deformation separate.

The correct option is In the parachutist scenario, apply extension to convert extension between centimetres and metres where required while keeping elastic versus plastic deformation separate.. It is correct because the scenario says air resistance changes until terminal velocity is reached, which must be interpreted through Hooke's law and spring constant. This directly supports the learning objective to convert extension between centimetres and metres where required. Use values 6, 12, and 13 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.