Part 2 is here: http://www.cramster.com/answers-jun-11/physics/momentum-part-2-s

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Part 2 is here: http://www.cramster.com/answers-jun-11/physics/momentum-part-2-show-work-part-1-here160-http-wwwcramstercom-answers-jun-11_1360151.aspx?rec=0

A massless spring with force constant 641 N/m is fastened at its left end to a vertical wall, as shown below. The acceleration of gravity is 9.8 m/s2. Initially, the 9 kg block and 2 kg block rest on a horizontal surface with the 9 kg block in contact with the spring (but not compressing it) and with the 2 kg block in contact with the 9 kg block. The 9 kg block is then moved to the left, compressing the spring a distance of 0.3 m, and held in place while the 2 kg block remains at rest as shown below. Determine the elastic energy U stored in the compressed spring. Answer in units of J.

Explanation / Answer

Energy of a spring = 1/2 kx2 = 1/2 * 641N/m * .3m = 96.15J

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