A rock is tossed up into the air. Just when it reaches the top(before it starts to come back down), all of its energy is in the form of what? A rock is tossed up into the air. Just when it reaches the top(before it starts to come back down), all of its energy is in the form of what? Solution At maximum height before it start to come back down its total inital kinetic energy converted into potential energy only. ----------- Comment in case any doubt or any other detail you are seeking except this..goodluck .