Suppose an object’s initial velocity is 10 meters per second and its final velocity is 4 meters per second Mass is constant. What can best be concluded about the object based on the work-energy theorem?

By the work-energy theorem, the net work on the object equals its change in kinetic energy. The change is ΔK = ½m(4² − 10²) = −42m joules, so it is negative because the object slows down. Its kinetic energy decreases, meaning energy is transferred from the object to the environment; therefore, choice A is correct.

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