Question

what is energy ? say SI unit of it​

Answer 1

$\huge\star\underline\mathbb\pink{ENERGY}$

The capacity and agility to do work is called as Energy.

$\huge\star\underline\mathbb\red{SI\:UNIT}$

Joules (J)

Answer 2

Energy is the capacity to do work t, the influence required to do the work ...

The S. I. unit of energy is Joule...