Apendulum has 573 j of potential energy at the highest point of its swing. how much kinetic energy will it have at the bottom of its swing?

If we consider all energy losses due to bearing friction and aerodynamic resistance as negligible, then the energy from the maximum potential energy and the zero kinetic energy will be preserved.

Given this assumption, the energy of the pendulum at the highest point (maximum potential energy) and the lowest point (zero kinetic energy) is equal.

Therefore,the lowest point  = the highest point  = 573 J.
The answer is  573 J.

Ray 2 should cross through the focal point on the right side of the lens

So since the snail is moving at 3.6  miles per hour you multiply by 5280 to change it into feet per hour. so you get 36*528 ft per hour. since there are 3600 seconds in an hour, you divide 36*528 by 3600. so simplifying we get 528/100 which is 5.28 ft per second