Can energy increase even when net work done is zero
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Work is the change in kinetic energy, so if work is zero, kinetic energy is fixed and speed is fixed. Velocity can change by having the particle change direction. Velocity need not be zero, and therefore displacement need not be zero. ... If an object is not displaced, then its speed stays unchanged and is zero.
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The kinetic energy of the package increases, indicating that the net work done called the work-energy theorem, and it actually applies in general even for forces . To reduce the kinetic energy of the package to zero.
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