**Unformatted text preview: **negative of the kinetic energy 3 K found in part (c), or . ) m N 10 03 . 7 ( N) 600 , 2 ( 2 1 ) ( J 10 72 . 3 2 3 4 3 2 3 3 4 3 x x kx x f mg K × +-= +--= × = (In this calculation, the value of k was recalculated to obtain better precision.) This is a quadratic in 3 x , the positive solution to which is [ ] m, 746 . ) J 10 72 . 3 )( m N 10 03 . 7 ( 4 N) 10 (2.60 N 10 60 . 2 ) m N 10 03 . 7 ( 2 1 4 4 2 3 3 4 3 = × × + × + × × × = x corresponding to a force of N 10 05 . 1 5 × and a stored energy of J 10 91 . 3 4 × . It should be noted that different ways of rounding the numbers in the intermediate calculations may give different answers....

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