Physics
Which of the quantity, velocity or acceleration determines the direction of motion ?
Motion in One Dimension
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Answer
Velocity determines the direction of motion as velocity is the distance travelled per second by a moving object in a particular direction.
Positive or negative sign of velocity indicates the direction of motion.
Acceleration is the rate of change of velocity with time. It does not say anything about direction of motion.
Positive or negative sign of acceleration tell us whether the velocity is increasing or decreasing.
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