3. Speed is a scalar quantity. Justify this statement.
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Answer:
speed is scalar quantity as it only have magnitude but not direction
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Explanation:
A scalar quantity is one which can be defined with magnitude only.
Speed is distance/time, and its unit is m/s. When we talk about speed, we say that the car is moving 10 m/s, it is not necessary to specify any direction.
Further, speed does not obey the rules of vector addition and other vectoral operations.
On the other hand, velocity is analogous to speed and it is a vector quantity. Velocity depends on direction, and it obeys the rules of vector operations.
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