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Whenever you're unsure, you can also use the units to help you. Uncertainty in velocity (Δv) should have the units m/s so you would multiply the % by the velocity to get the uncertainty in velocity in meters per second. Hope this helps.
Adding on to what the other posts have said, multiplying your velocity by the decimal form of your percentage should yield the change in velocity. However, you should keep in mind that for uncertainties, the uncertainty can be both additive and subtractive. For example, the 1% uncertainty of 4.5 is .045. This could mean that the velocity is either 4.545 or 4.455. You would need to find the difference between these two velocities in order to get the absolute velocity change.
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