Updates velocity test that still had wrong m/s -> mph conversion direction. Also updates for unsigned meaning of mph().
Updates velocity test that still had wrong m/s -> mph conversion direction.
Also updates for unsigned meaning of mph().

bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn