What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 N/m?

The potential energy stored in a compressed spring is U = ½kx². Using k = 95 N/m and compression x = 0.65 m gives U = ½(95)(0.65)² ≈ 20 J. The block’s mass is not needed for this calculation, so the correct choice is 20 J.

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