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describe the difference between scalar and vector quantity.
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a scalar quantity is a one-dimensional quantity that is only defined by a magnitude, while a vector quantity is a multiple-dimensional quantity that is defined by both magnitude and direction. scalar quantities include speed, mass, temperature, energy and volume, while vector quantities include velocity, acceleration, force and momentum. a scalar quantity can be represented in one dimension or unit, while a vector quantity always requires two or more units to describe the magnitude and direction.
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