Neglect the affect of resistance forces.

As the object moves from point A to point D across the surface, the sum of its gravitational potential and kinetic energies ____.

Decreases only

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Decreases and then increases

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Increases and then decreases

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Remains the same

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Solution

The correct option is D Remains the same
The total mechanical energy (i.e., the sum of the kinetic and potential energies) is everywhere the same whenever there are no external or non conservative forces (such as friction or air resistance) doing work.

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Neglect the affect of resistance forces. As the object moves from point A to point D across the surface, the sum of its gravitational potential and kinetic energies ____.

The correct option is D Remains the sameThe total mechanical energy (i.e., the sum of the kinetic and potential energies) is everywhere the same whenever there are no external or non conservative forces (such as friction or air resistance) doing work.

Neglect the affect of resistance forces.

As the object moves from point A to point D across the surface, the sum of its gravitational potential and kinetic energies ____.

The correct option is D Remains the same
The total mechanical energy (i.e., the sum of the kinetic and potential energies) is everywhere the same whenever there are no external or non conservative forces (such as friction or air resistance) doing work.