Two blocks of masses 3 kg and 6 kg rest on a horizontal smooth surface. The 3 kg block is attached to a spring of constant $k = 900$ N/m which is compressed 2 m from equilibrium (Figure 5.133). The 6 kg mass is at rest at 1 m from the mean position. The 3 kg block strikes the 6 kg mass and the two stick together:

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ω = 900/3 ​ = 300 ​ . At x = 1 : v = ω 4 − 1 ​ = 30 m/s. Momentum: 3 ( 30 ) = 9 v f ​ , v f ​ = 10 m/s. New ω f 2 ​ = 900/9 = 100 . A f 2 ​ = 1 + 1 = 2 , A f ​ = 2 ​ m.

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