please answer and explain.

38.13 Suppose you read in a textbook that \"at a point on the hill a vertical distance AZ below the top, the bike will be moving with v = V2gAz.\" Is v a shorthand notation for IFI or a compo- nent such as 1.3.? Defend your response. (Your answer will not depend on what g means, but assume a coordinate system in standard orientation.)