Apendulum has 557 j of potential energy at the highest point of its swing. how much kinetic energy will it have at the bottom of its swing? joules

As potential energy is highest at highest point of swing, so it will be lowest at lowest point. As sum of energy remains constant (according to conservation of energy), Kinetic energy will be highest at bottom of it's swing, which will be equal to highest potential energy at highest point i.e., 557 J

In short, Your Answer would be 557 Joules

Hope this helps!