Question

A quantity has value of –6.0 ms–1. It may be the

(1) Speed of a particle (2) Velocity of a particle

(3) Position of a particle (4) Displacement of a particle

Answer 1

It is velocity of the partice since it is vector in quantity and its unit is m/s.

Answer 2

The given quantity having a value of -6.0 ms⁻¹, may be the "Velocity of a particle". (option 2)

• We can observe that here, the quantity is given to have a value of -6 m/s.
• Since the unit of this quantity is m/s, it could be either the speed or velocity of a particle, object, or body.
• Now, it can be seen that the quantity has a value of 6 m/s, and it is negative. The negative sign is used in a sense to represent the opposite direction.
• So, as the quantity has both the value that is 6 m/s and a direction represented by the negative sign, it must be a vector quantity.
• Now, between speed and velocity, velocity is a vector while speed is a scalar.
• Thus, the given quantity having a value of -6.0 ms⁻¹, may be the "Velocity of a particle". (option 2)

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