Athird class lever has a mechanical advantage of < 1. what is an example of a third class lever and why use it?

Ibelieve the answer is arteries

The answer is  the potential energy of the bob at position b is 1.47 joules.if the maximum height of the bob is 0.45 meters when it swings back,1.323   joules of energy was transformed to thermal energy.hope this

The force is push or pull