Question

A quantity has value of -6.0 ms. It may be the- (A) Speed of a particle (B) Velocity of a particle (C) Position of a particle (D) Displacement of a particle
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Answer 1

It may be the velocity of a particle. The unit m/s denotes that it is velocity or speed and thereafter the sign minus denotes that it is velocity not speed.So -6.0 m/s may be the velocity of the particle

Answer 2

Option B is correct

(B) Velocity of a particle

Explanation :

The velocity of a particle (actual or imagined) in a medium while it transmits a wave is known as particle velocity. The meter per second (m/s) is the SI unit for particle velocity. This is often a longitudinal wave of pressure, as with sound, but it may also be a transverse wave, as with a taut string's vibration.

When applied to a sound wave travelling through a fluid medium such as air, particle velocity refers to the physical speed of a parcel of fluid moving back and forth in the same direction as the sound wave.