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**Unformatted text preview: **energies are both zero, so the net work done is zero, and 2 1 k 2 ( ) kx mg x L = + . Solving for L , , m 813 . ) m 250 . ( ) s / m 80 . 9 )( kg 50 . 2 )( 30 . ( ) m 250 . )( m / N 250 )( 2 / 1 ( ) 2 / 1 ( 2 2 k 2 =-=-= x mg kx L or 0.81 m to two figures. Thus the book moves m 06 . 1 m 25 . m 81 . = + , or about 1.1 m....

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