A rubber band has potential energy of 5 J. If the spring constant of the rubber band is 50 N/m, what is the displacement of the rubber band?

Elastic potential energy is given by U = ½kx². Solving for displacement gives x = √(2U/k) = √(2 × 5 J ÷ 50 N/m) = √0.2 ≈ 0.45 m. The closest choice is 0.4 m.

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