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define velocity
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Rate of change of Distance....
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Velocity is a term that describes how fast and in what direction an object is moving. Velocity is a vector quantity, which means it has both magnitude (speed) and direction. For example, a car moving at 60 km/h to the east has a different velocity than a car moving at 60 km/h to the west, even though they have the same speed. The unit of velocity is usually meters per second (m/s) or kilometers per hour (km/h) in the International System of Units (SI).
To calculate the velocity of an object, we need to know its displacement and the time it took to travel that distance. Displacement is the change in position of an object from its initial point to its final point. For example, if a person walks 10 meters to the north and then 5 meters to the east, their displacement is 11.2 meters to the northeast, not 15 meters. The formula for velocity is:
Velocity=Displacement/Time
If the velocity of an object changes over time, either in speed or direction or both, then the object is said to have acceleration. Acceleration is the rate of change of velocity. For example, a car that speeds up or slows down or turns a corner has acceleration. The formula for acceleration is:
Acceleration=Change in velocity/Time
Velocity is different from speed, which is the distance traveled by an object per unit time, regardless of direction. Speed is a scalar quantity, which means it only has magnitude, not direction. For example, a car moving at 60 km/h has the same speed whether it is going east, west, north, or south. The formula for speed is:
Speed=Distance/Time
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