A squirrel in a tree drops an acorn. How long does it take the acorn to fall 40 feet?

I need more information to answer this question. Like what is the acorns mass?

Explanation:

Potential energy is energy stored in an object due to its position or arrangement. Kinetic energy is energy of an object due to its movement - its motion. All types of energy and be transformed into other types of energy. This is true for potential and Kinetic energy as well.