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Whenever the particle's velocity and acceleration have the same sign (positive or negative), the particle's speed is increasing. Likewise, when the particle's velocity and acceleration have opposing signs (one positive, one negative), the particle's speed is decreasing.
What is velocity?
Velocity is the directional speed of a moving item as an indication of its rate of change in position as seen from a specific frame of reference and measured by a specific time standard (e.g., 60 km/h northbound). [1] The idea of velocity is crucial in kinematics, the part of classical mechanics that explains the motion of bodies.
Velocity is a physical vector quantity that requires both magnitude and direction to define. Speed is the scalar absolute value (magnitude) of velocity, and it is a coherently derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s or ms1).
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