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C Sign In or Sign Up | Ch PEF Etension . . X public View Favorites Tools Help LI Question Completion Status IE Unit PEF Extension A Quiz Question 2 Imagine a low-friction cart colliding with a rubber band with a large yellow sponge fastened to the top of the cart The rubber band is set high enough above the surface so that, when the sponge cart" strikes the rubber band, it is the elastic sponge that actually makes contact with the rubber band Consider the time between when the sponge first makes contact with the rubber band and when the sponge cart comes to a full stop. Which of the following choices best describes what happens to the elastic potentiel energies of the sponge and the rubber band?

Explanation / Answer

Total mechanical energy remains constant assuming that there is heating, etc. source of loss. That means, when the cart is being stopped by the sponge and rubber, it’s kinetic energy is being transformed to the elastic potential energies of the sponge and the spring. Finally the entire kinetic energy transformed to the potential energy and the cart stops.

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