Mechanical energy remains constant (conserved) if only conservative forces act on the particles.
In this sense, the following forces are conservative:
-Gravitational
-Elastic
-Electrostatics
While the Friction Force and the Magnetic Force are not.
According to this, mechanical energy is conserved in the presence of electrostatic and gravitational forces. Therefore the correct options are A and D.
Answer:
A- electrostatic
C- magnetic
D- gravitational
Explanation:
As per mechanical energy conservation law we can say that when all conservative forces are present on the system then mechanical energy is always conserved
So here we have to choose all such options which will give conservative forces only
so correct answers are
A- electrostatic
C- magnetic
D- gravitational
