The total energy of the system is 88.2 J
Explanation:
The total (mechanical) energy of an object is given by:
[tex]E=PE+KE[/tex]
where
PE is the potential energy
KE is the kinetic energy
At the starting point, the object is at rest: this means that its kinetic energy is zero, so all its energy is potential energy, which is given by
[tex]PE=mgh[/tex]
where
m is the mass of the object
g is the acceleration of gravity
h is the height of the object
In this problem, we have (at point A):
m = 3.0 kg
[tex]g=9.8 m/s^2[/tex]
h = 3.0 m
Substituting, we find:
[tex]E=U=(3.0)(9.8)(3.0)=88.2 J[/tex]
Learn more about potential energy:
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