Assume that a hockey player skates 60 feet in 3 seconds. what is the player’s speed? if the hockey player travels this distance from east to west, what is his velocity?

What is a good example of instantaneous speed

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?

I’ve been stuck on this for a while