For which of these questions could a testable hypothesis be developed? Check all that apply.

A testable hypothesis predicts a measurable result that can be investigated. The effect of rubber-band width on stretch distance and material thickness on insulation can both be measured. Whether objects fall at the same speed can also be tested by measuring their falling times; “coolest invention” and “most fun experiment” depend on personal opinion.

AI-written and checked against the verified answer.