ch08-p079 - 79. The initial height of the 2M block, shown...

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79. The initial height of the 2 M block, shown in Fig. 8-64, is the y = 0 level in our computations of its value of U g . As that block drops, the spring stretches accordingly. Also, the kinetic energy K sys is evaluated for the system -- that is, for a total moving mass of 3 M . (a) The conservation of energy, Eq. 8-17, leads to K i + U i = K sys + U sys ¡ 0 + 0 = K sys + (2 M ) g (–0.090) + 1 2 k (0.090) 2 . Thus, with M = 2.0 kg, we obtain
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