What is energy in physics class 9

What is the SI unit of work?Newton metre (Nm) or Joule (J). Define potential energy ?The object's potential energy is the energy present in it as a result of its location or configuration.. What are the various forms of energy as in NCERT chapter 11 class 9?Energy can exist in the form of mechanical energy (potential energy + kinetic energy), heat energy, sound energy, chemical energy, and light energy.. What is power?Power is defined as the rate of doing work or the rate of transfer of energy.Power = work/time=Fv, where F is the forve and v is the velocity [pdf]
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