A box is initially at the top of a slide, storing 80 J of gravitational energy. The isolated system includes the box, slide and earth.
As the box slides down the frictionless slide, what happens to the total energy of the system?

1-the isolates system stores slightly less than 80 J of total energy, and it is converted to a different form of energy

2- The isolated system stores 80 J of total energy, but it is converted to a different foe of energy

3- The total energy of the system increases to more than 80 J as it gains other forms of energy

4- The total energy of isolated system decreases to 0 once the box reaches the bottom of the slide