Answer:
1. A quantity that has magnitude but no particular direction is described as scalar.
A quantity that has magnitude and acts in a particular direction is described as vector.
2. Scalar, a physical quantity that is completely described by its magnitude; examples of scalars are volume, density, speed, energy, mass, and time.
Other quantities, such as force and velocity, have both magnitude and direction and are called vectors.
3. For example, displacement, velocity, and acceleration are vector quantities, while speed (the magnitude of velocity), time, and mass are scalars.
To qualify as a vector, a quantity having magnitude and direction must also obey certain rules of combination.
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