What is energy? Prove that the work done by any object is equal to the difference of two energies present in the object.
The capacity of doing work is known as energy.
Mechanical energy has two types:
1. Kinetic energy- The energy possessed by any moving object by virtue of its motion is called kinetic energy
2. Potential energy- The energy possessed by a body by virtue of its shape and position.
The unit of energy is joule.
The work done (W) by a body is given by
W = F × s
W = ma × s
Now, if the body of mass m has initial velocity and final velocity as u and v respectively, then
So,
W = Final Kinetic energy-initial kinetic energy
W = Change in kinetic energy
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