hey, I'm currently in grade 12, and so far we just started a review over the conservation laws unit, which includes (energy related theorm, work, power, momentum, collisions, mechanical energy ect.) Anyways I cant seem to figure out these two multiple choice theory questions, was hoping someone can explain them to me, thanks. Which statement describes a conclusion that can be made about a closed system where there has been an increase in its enery? a)Work has been done on the system b)Mass has been converted to energy c)Kinetic energy of the system is increased d)Potential energy of the system has decreased And: "Ruth" is diving from a tower 10.0m above the water. When she is 5.0m above the surface of the water her: a)momentum and kinetic energy are about equal b)velocity is half of the velocity she will have when she touches the water c)potential energy, with respect to the water, and her momentum are about equal d)potential energy, with respect to the water, and her kinetic energy about equal ---- was hoping someone can explain these theory questions to me, thanks alot.