How does the voltage across a resistor compare the voltage across an inductor vl vr?

The voltage across a resistor is always the product of its resistance
and the current through it.

... If the power supplied to the circuit is DC, then the inductor behaves
like another resistor, equal to the resistance of the wire or other material
from which it's constructed.  Its inductance has no effect in a DC circuit.

... If the power supplied to the circuit is AC, then the instantaneous voltage
across an inductor is

 (its inductance) x (the rate at which the current through it is changing) .

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction