A stone of 20 kg mass and a tank containing 200 kg of water comprise a system. The stone is 15 m above the water level initially. The stone and water are at the same temperature initially. If the stone falls into water, determine AU, APE, AKE, Q and W, when (i) the stone is about to enter the water (neglect by air drag on the stone), (ii) the stone and water have come to rest in the tank (but no heat was transferred outside the system), (iii) the heat is transferred to the surroundings so that the stone and water come to their initial temperature. 15 m Stone Water -Tank Boundary