In equation form, Or KE+PE=constant KEi+PEi=KEf+PEf where i and f denote initial and final values. This is known as the conservation of mechanical energy.
Κi + Ûg,i = kf + U,g,f
A closed system is a system where exists energy interactions with surroundings, but not mass interactions.
If we neglect any energy interactions from boundary work, heat, electricity, magnetism, and nuclear phenomena and assume that process occurs at a steady state and all effects from non-conservative forces can be neglected, then the equation of energy conservation is reduced to this form:
K + Ug = 0 (1)
Where:
K -Change in kinetic energy of the system, measured in joules.
Ug - Change in gravitational potential energy of the system, measured in joules.
If we know that K = Ki - Kf and Ug = Ug,i - Ug,f, then we get the following equation:
Ki + Ug,i = Kf + Ug,f, (2)
Where i and f stand for initial and final states of each energy component.
Hence, the right answer is Ki + Ug,i = Kf + Ug,f,.
Learn more about the law of conservation of energy at
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