ch07-p030 - 30. The work done by the spring force is given...

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30. The work done by the spring force is given by Eq. 7-25: 22 1 () 2 s if Wk x x =− . Since x Fk x , the slope in Fig. 7-36 corresponds to the spring constant k . Its value is given by 3 80 N/cm=8.0 10 N/m k . (a) When the block moves from 8.0 cm i x =+ to 5.0 cm x , we have 32 2 1 (8.0 10 N/m)[(0.080 m) (0.050 m) ] 15.6 J 16 J. 2 s W = (b) Moving from i x to x , we have 2 1 (8.0 10 N/m)[(0.080 m) ( 0.050 m) ] 15.6 J 16 J.
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