There is elastic potential energy in the spring that is compressed against the car.
In the final state there is kinetic energy in the car, and spring, and there is internal energy in the car as all of the energy exchanged was not perfectly changed.
There is no work done on the system as there is nothing outside the system that alters the amount of work it can do.
The amount of energy never changes, it is only converted to another kind of energy.
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Still not a correct accounting of the energy in the final state. Please review the lessons of energy and work on the class web page and reconsider your response.
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Make a NEW POST with the same title as the assignment and add the word "continued"
Your next revision must be posted before Wed Apr 02 2008 06:43:30 GMT-0400 (Eastern Daylight Time) or your incomplete grade will be recorded as final.
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