Examlex
The center of mass of a system of particles has a constant velocity if:
Alcohol
A psychoactive substance found in beverages such as beer, wine, and spirits, known for its effects on mood, behavior, and health.
Night Terrors
Intense episodes of fear that occur during sleep, often causing the person to wake up in a terrified state.
Sleepwalking
A behavior disorder that originates during deep sleep and results in walking or performing other complex behaviors while asleep.
Children
Individuals in the early stages of human development, typically considered to be from birth to puberty.
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