Apendulum has 894 j of potential energy at the highest point of its swing. how much kinetic energy will it have at the bottom of its swing?

Energy is conserved.  You can't create it and you can't destroy it.  If there's nothing going on here that robs energy from the pendulum**, then it must have the same amount of energy at every point in its swing as it has at every other point.

If it has 894 J of energy at the highest point ... where its energy is all gravitational potential energy, then it must have the same 894 J of energy at the lowest point, where its energy is all kinetic energy.

** Examples of things that could be going on that would rob energy from the pendulum:  

-- air resistance

-- a fly lands on it while it's swinging

--  somebody breathes on it

-- it bumps into something

-- friction at the top pivot

-- etc.

There's ALWAYS something.  If it isn't one thing, then it's something else.  That's why pendulums always stop eventually.

mass and volume are the answers you are looking for