A marble , mass 150g, is fired from a toy spring gun into a lump of clay that rests on the edge of a 2.00m high counter top. The speed of the marble is 25.0m/s and the mass of the clay is 0.350kg  the collision that follows is perfectly inelastic What is the speed of the clay with the marble in it as they zoom together off the counter top? Use energy conservation to find their speed as they land together on the floor beneath the counter (just before they are brought to a stop)

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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.