Two hockey pucks slide toward each other on a horizontal table surface with a speed of 6.0m/s. After a head-on collision, an observer claims that the pucks rebound with a speed of 12m/s. Identify the correct statement below.   A. If the surface was inclined, then the observation could be valid.   B. If potential energy was released to the objects during the collision, then the observation could be true.   C. Momentum was not conserved and the observer was wrong.   D. If the hockey pucks had different masses, then the observation could be valid.   E. If the surface was frictionless (between each puck and the ice), then the observation could be valid.

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Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.