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Which of the following is a speed, not a velocity?
Velocity is a vector quantity which means that it has both magnitude and direction. Speed is a scalar quantity which only is defined by its magnitude. (magnitude refers to its numerical value or absolute value) Because speed is a scalar quantity it will not have a direction which means that answer A and answer D are wrong because they have the direction of east and south. The answer is choice C. 35m/s and not B. -35m/s because speed cannot be a negative value.(note that while speed cannot be negative velocity can)
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