A spring has natural length 29 cm. Compare the work (in J) W₁ done in stretching the spring from 29 cm to 39 cm with the work (in J) W₂ done in stretching it from 39 cm to 49 cm. (Use k for the spring constant.) W₁ = J W₂ = J How are W₂ and W₁ related? W₂ = W₁