Correct Answer - Option 3 : Mechanical energy
CONCEPT:
Potential Energy:
- The energy of an object obtained by doing work against the conservative forces like spring force and gravitational force is called potential energy.
- The potential energy of an object at a height h from the ground is given as
⇒ P = mgh
Kinetic Energy:
- The energy obtained by an object by virtue of its motion is called kinetic energy.
\(\Rightarrow K = \frac{1}{2}mv^2\)
K is kinetic energy, v is the speed of the object, m is the mass of the object.
-
Mechanical Energy: The sum of potential energy and kinetic energy is called mechanical energy.
EXPLANATION:
- From the above, it is clear that the total mechanical energy is the sum of potential energy and kinetic energy. Therefore option 3 is correct.