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A spring and block are in the arrangement of Fig. 7-10. When the block is pulled out to x = +4.0 cm, we must apply a force of magnitude 360 N to hold it there. We pull the block to x = 11 cm and then release it. How much work does the spring do on the block as the block moves from xi = +5.0 cm to (a) x = +3.0 cm, (b) x = −3.0 cm,(c) x =−5.0 cm, and (d)x = −9.0 cm?
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