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January 31, 2015

January 31, 2015

Posted by **annie** on Thursday, May 21, 2009 at 9:31pm.

If the spring is compressed 2.1 m, what speed will it give to a 4.0 kg ball held against it and then released?

- physics imperfect spring -
**Damon**, Thursday, May 21, 2009 at 9:35pmWork done = integral F dx

= 150 x^2/2 + 12 x^4/4

= 75 x^2 + 3 x^4

=75 (2.1)^2 + 3 (2.1)^4

= 389 Joules

= (1/2) m v^2

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