Answer:
The total mechanical energy is equal to P.E+K.E.
(a) is correct.
Explanation:
Potential energy :
Potential energy is the store energy and It is represents by U.
It is defined as:
[tex]P.E= U =mgh[/tex]
Where, m = mass of the object
g = acceleration due to gravity
h =height
Kinetic energy :
Kinetic energy is defined as the energy of motion. It represents by K.
It is defined as:
[tex]K.E = \dfrac{1}{2}mv^2[/tex]
Where, m = mass of the object
v = velocity of the object
According to law of conservation,
The total mechanical energy is the sum of the potential energy and kinetic energy is constant in time.
[tex]T = P.E+K.E[/tex]
Hence, The total mechanical energy is equal to P.E+K.E.
