Question

Among the following which one is the symbol for speed.
(A). ${\rm{K}}$
(B). ${\rm{s}}$
(C). ${\rm{r}}$
(D). ${\rm{v}}$

Answer 1

Hint: There are large numbers of parameters used while performing calculation in physics. So, it is easy to use symbols or notations to represent any physical parameter during calculation.

Complete step by step answer:The first symbol is ${\rm{K}}$. In physics the symbol $K$ represents two parameters first one is the Kinetic Energy and second one is Bulk Modulus.


The Kinetic Energy of an object of mass $m$ which is traveling with the speed $v$ is $K = \dfrac{1}{2}m{v^2}$. The Joule is the unit of Kinetic Energy.

The formula of the bulk modulus is given by $K = - \dfrac{{\Delta P}}{{\dfrac{{\Delta V}}{V}}}$. The unit of Bulk Modulus is Pascal, and it is scalar quantity.

The second symbol is $s$. In physics, this symbol represents the Displacement. The change in position of an object is called displacement. The unit of displacement is Meter of centimeter or millimeter, and it is a vector quantity.

The third term is $r$. In physics, this symbol represents the radius or radius of curvature. The unit of radius is Meter.

The last symbol is $v$. In physics, this symbol represents the velocity or speed on an object.

The speed of an object is the rate of change of displacement per unit time.
$v = \dfrac{{ds}}{{dt}}$

The unit of speed is Meter per seconds. It is a vector quantity.

Note:We use the symbols to define the physical quantity in physics. Sometimes, the symbol of any quantity is the first letter of the name of that quantity like for speed we use symbol $s$ but sometime it’s completely different from the name of that quantity like for the speed of light we use symbol $c$. So, it creates confusion for students.