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Insidious
Hey there! 

There are two different forms of mechanical energy: Kinetic energy and Potential energy. 

Kinetic energy is created by an object's motion. 
Potential energy is created by an object's position or its configuration. 

Thank you! 
EjerciciosFyQ
a) Kinetic energy. It is a type of energy which depends on the mass and speed of a system:

[tex]E_k = \frac{1}{2}mv^2[/tex]

b) Gravitational potential energy: This type of energy depends on the position (height) and mass of the system:

[tex]E_p = m\cdot g\cdot h[/tex]