Question

What is velocity and its formulae
Define sound

Answer 1

VELOCITY:
Velocity is the measure of the speed of the object in a specific direction. Velocity is a vector quantity so both the magnitude and the direction of the object are required to define the velocity of the object. The speed and velocity of an object are interrelated terms.
v= displacement/time
SOUND:
The sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium is called sound
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Answer 2

Velocity is the measure of the speed of the object in a specific direction. Velocity is a vector quantity .............
v= displacement/time
SOUND:-
The vibrations created by any object  through any medium is called sound