Consider the object attached to a spring in The animation considers an object attached to a spring. Assume that the spring is ideal (i.e. spring has no mass and the force required to stretch or compress the spring is given by Hooke's law). There are no external forces acting on the object-spring system. The user is asked to answer questions about the object-spring system.
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Physlets, that is, the applets themselves, may be used to author new problems and these problems may be distributed along with the Physlet jar files for non-profit, educational purposes without requesting permission under certain conditions.