(Solved): A stone of 20 kg mass and a tank containing 200 kg water comprise a System. The stone is 15 m above ...

A stone of 20 kg mass and a tank containing 200 kg 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, then determine ?U, ?PE, ?KE, Q and W, when (i) The stone is about to enter the water, (ii) The stone has come to rest in the tank, and (iii) The heat is transferred to the surroundings in such an amount that the stone and water Come to their initial temperature.