A stone drops from a 5m tall cliff. If all its potential energy gets converted into kinetic energy. Calculate the speed of the stone just before it touches the bottom of the cliff.(g=10m/s^2)​

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?