Question

If the object starts at point A what is the total energy of the system?

Answer 1

The total energy of the system is 88.2 J

Explanation:

The total (mechanical) energy of an object is given by:

$E=PE+KE$

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

$PE=mgh$

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

$g=9.8 m/s^2$

h = 3.0 m

Substituting, we find:

$E=U=(3.0)(9.8)(3.0)=88.2 J$

Learn more about potential energy:

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