10.74.Model:Mechanical energy and momentum are conserved during the expansion of the spring. Visualize:Please refer to Figure CP10.74. Solve:Example 10.8 is a very similar problem, except that the objects are initially at rest. We can use the solution from Example 10.8 for this problem in a reference frame S′in which the two carts are initially at rest, then transform the answer to the frame S in which the carts are initially moving. Thus in the S′frame, ()()()2if22211xkxvmmmΔ′=+()()2ff121xxmvvm′′= −Let the 100 g cart be Cart 1 and the 300 g cart be Cart 2. With
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