the answer to your question is
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the answer is the total amount of energy stays the same.
- according to the conservation law of mechanical energy, for a closed system that entails the presence of just conservative forces ( independant on the pathway between two points), the total mechanical energy of the system (which is the sum of potential and kinetic energies) remains constant (stays the same).
- clearly, the sum at any of the 4 points = 50 j..
the wolves started to over hunt and after so long they were up to be hunted by humans.
the methane molecule undergoes oxidation and the carbon is oxidized to carbon dioxide and hydrogen to water.
in this reaction there is cleavage of four c-h bonds and two o=o bonds
there will be formation of two c=o bonds and four o-h bonds.
overall due to more bond cleavage energy there will be evolution of energy. thus combustion is an exothermic reaction.