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When an object changes its motion, it is accelerating. ... Like velocity, acceleration has a direction. If an object speeds up, the acceleration is in the direction that the object is moving. If an object slows down, the acceleration is opposite to the direction that the object is moving.

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The change in position is determined by the distance and direction of an object's change in position from the starting point (displacement). Direction Direction is the line, or path along which something is moving, pointing, or aiming.

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The rate of change of position is velocity, and the rate of change of velocity is acceleration. Speed is the absolute value, or magnitude, of velocity. The population growth rate and the present population can be used to predict the size of a future population.

We describe motion in terms of velocity and acceleration. Velocity: The rate of change of displacement of an object (displacement over elapsed time) is velocity. Velocity is a vector since it has both magnitude (called speed) and direction.

Velocity (Rate of change of position) Velocity is equivalent to the speed of the object along with the direction of motion. Velocity of an object can change with the change in speed and the direction of object.

Velocity (Rate of change of position) Velocity is equivalent to the speed of the object along with the direction of motion. Velocity of an object can change with the change in speed and the direction of object. Speed and velocity have the same units, that is, m s 1 or m/s.