I would think direction since velocity is a vector. Could also be speed. Speed is just a rate, velocity has speed and a direction. Short answer: direction with a speed caveat to account for the ambiguity in the question.
Three basic levels of measurement are nominal, ordinal, and interval/interval-ratio.
interval
Three basic levels of measurement are nominal, ordinal, and interval/interval-ratio.
the level of measurement is interval
Measurement is based on several tenets: Interval, quantitative value, and relative baseline. Interval means the measurement cannot be based on ordinal values as they have no interval. EX: There is no interval between first place and fourth place. Quantitative means qualitative values, like orange, smooth, and such, cannot be used to measure. Numbers or number equivalents have to be used. Relative baseline means there has to be a "measuring stick" against which the measurements are made. Some sort of standard, like the metric system standards liter, meter, and second.
It is a ratio scale of measurement.
interval
yes
Nominal or category;Ordinal scale;Interval scale; andRatio scale.
You need the initial and final velocities, and time interval to answer this question.
interval
Interval