EX: A system consisting of a stone of mass 10 (kg) and a container containing water. The stone was initially 2 (m) above the surface of the water, and that the stone and the water were at the same temperature. After that the stone fell into the water. Calculate the change in internal energy, kinetic energy, potential energy, as well as the heat and work received for the following cases. 1-At the moment when the stone was about to enter the water 2-At the moment when the stone becomes in a state of rest in the water 3-After the heat has moved to the ocean, while the stone and water have returned to the initial temperature