Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: 
Acceleration that does not change in time is called uniform or constant acceleration. The velocity at the beginning of the time interval is called initial velocity, , and the velocity at the end of the time interval is called final velocity, . In a velocity versus time graph for uniform acceleration, the slope of the line is the acceleration. The equation that describes the curve is .


Question: The velocity at the beginning of the time interval is called what?
initial velocity
Initial velocity.