problem07_21

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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7.21: a) In this situation, 0 2 = U when , 0 = x so J 0250 . 0 2 = K and s. m 500 . 0 kg 0.200 J) 0250 . 0 ( 2 2 = = v b) If s, m 50 . 2 2 = v , J 625 . 0 s) m kg)(2.50 (0.200 ) 2 1 ( 1 2 2 U K = = = so m. 500 . 0 m N 5.00 J) 625 . 0 ( 2 1 = = x Or, because the speed is 5 times that of part (a), the kinetic energy is 25 times that of part (a),
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Unformatted text preview: and the initial extension is m. 0.500 m 100 . 5 = ×...
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