According to Newton's second law, these two effects will exactly cancel each other, so the acceleration will be the same in all cases.

The other possibility is that they have a positive kinetic energy and a negative potential energy that exactly cancels.

The two effects, in general, do not exactly cancel.

In a perfect conductor, an arbitrarily large current can be induced, and the resulting magnetic field exactly cancels the applied field.

In both cases, the electron arrangement is so as to exactly cancel the magnetic moments from each electron.

External electric fields induce surface charges on metal objects that exactly cancel the field within.

The effects may exactly cancel, but that depends on specifically how much rolling friction your ball encounters on the ramp.

If successful, it will exactly cancel the drop along the leads, yielding the correct voltage at the input terminals of the load.

(ideal world, where things exactly and truely cancel - hard to do in practice).

When properly adjusted, this deflection exactly cancels the downward slope of the scanlines.