Based on principle of conservation of energy, it is known that energy can only be converted, not destroyed. In a vacuum without gravity, will a moving mass move forever? i mean its like the kinetic energy of the moving mass cant be converted into heat/sound energy, so does that mean that the moving mass will forever have kinetic energy?
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If you don't take into account the gravitational pull of nearby planets, any drag due to gases or externallity, then yes that object will always have kinetic energy.