A Math Book and a Science Book Are Tied Together

Multiple Choice

A math book and a science book are tied together with a length of string.With the string taut,one book is pushed off the edge of a table.As it falls,the other book is dragged horizontally across the table surface.With no friction,acceleration of the books is

A) zero.
B) g/2.
C) g.
D) between zero and g.
E) greater than g.