Question

0.3 m 3 kg 8 kg
012 (part 1 of 4) 10.0 points A massless spring with force constant 277 N/m is fastened at its left end to a vertical wall, as shown below. The acceleration of gravity is 9.8 m/s 2 . Initially, the 8 kg block and 3 kg block rest on a horizontal surface with the 8 kg block in contact with the spring (but not compressing it) and with the 3 kg block in contact with the 8 kg block. The 8 kg block is then moved to the left, compressing the spring a distance of 0.3 m, and held in place while the 3 kg block remains at rest.Determine the elastic energy U stored in the compressed spring. Answer in units of J.

Answer 1

Elastic energy U=0.5kx² = 0.5 x 277 x 0.3 x 0.3 = 12.465 J

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