1.

How can you prove that the total energy remains constant at any point of movement of the ball from rest to the top​

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Answer:

Mechanical energy is the sum of the potential and kinetic energies in a system. The principle of the conservation of mechanical energy STATES that the TOTAL mechanical energy in a system (i.e., the sum of the potential plus kinetic energies) remains CONSTANT as LONG as the only forces acting are conservative forces..

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