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Motion in One Dimension

• The position of a particle moving along the x-axis is the x-coordinate of the particle; it may be positive or negative.
• Displacement is the final position minus the initial position; it may be positive or negative.
• Average speed = Distance/Time.
• Average velocity = Displacement/ Time.
• Instantaneous velocity is the rate of change of position.
• Instantaneous acceleration is the arte of change of velocity.
• If acceleration is constant, some simple relations hold among the displacement, velocity, acceleration, and time.