Think of a few other ways to put the cart of Figure 5.8 in motion. In each
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Think of a few other ways to put the cart of Figure 5.8 in motion. In each case, can you account for the increase in the cart's kinetic energy by either a change in state or a change in motion of another object?
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Figure 5.8 Initial and final energies for two choices of system. (a) Expanding spring accelerates cart from rest www Spring relaxed Spring compressed (b) Initial and final energies: system cart only K Ei Cart speeds up. K Ein K+K Finer (c) Initial and final energies: system = cart + spring www K Einzi K+ Einri K, Einf K State of cart doesn't change. Spring expands. AK AE Eini
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