A Baseball Is Hit with a Bat And,as a Result,its

A baseball is hit with a bat and,as a result,its direction is completely reversed and its speed is doubled.If the actual contact with the bat lasts 0.45 s,what is the ratio of the acceleration to the original velocity?

A) -6.7 s^-1
B) -4.4 s^-1
C) -2.2 s^-1
D) -0.15 s^-1