Answer:
Point 1. most extreme point. PE 100%
Point 3 point at mid-height PE 50%
Point 5 lowest point PE 0%
Explanation:
The energy in a pendulum is conserved if we ignore the friction of the air, the total energy is
Em = ½ k A²
at each point the energy can be written as a potential part and a kinetic part
Em = PE + K
where Pe is the potential energy and K the kinetic energy
In the entire trajectory the energy passes from one form to the other.
In general there are some points of very high interest.
Point 1. most extreme point in this case the pendulum is stopped and the
Em = PE 100%
Point 3. point at mid-height
Em = PE + K
at this point the energy is 50% of each
Point 5. lowest point, at this point the body has a height of ero so its potential energy is zero
Em = K 100%
potential energy is 0%
