Two books with different masses fall off the same bookshelf. as they fall, which has more kinetic energy and why

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

1/0.14nm = 10^10/1.4 a lot