<span>238,900 mi hope it helps :)</span>
The change of state that is occurring is from the liquid state to the solid state.
I assume that the ball is stationary (v=0) at point B, so its total energy is just potential energy, and it is equal to 7.35 J.
At point A, all this energy has converted into kinetic energy, which is:

And since K=7.35 J, we can find the velocity, v:
Answer:
The strength of gravity decreases.
An example of that would be if you were in space; you float around because there's no gravity.
Construction, like building a home/building, digging, like in a mine, and opening a soda can, where the part to open is a lever.