Question

Why speed and velocity is denoted by v

Answer 1

Answer:

Because it is the symbol to denote speed and velocity

Answer 2

Answer:

Both speed and final velocity are denoted by v, but since speed is a scalar quantity so it is denoted by only v, and velocity is a vector quantity , so it is denoted by v with an arrow upwards ( ---> below this v , stands for vector quantity, where v is final velocity. )