P $($Power$)=3000$ W

Ra $($Armature resistance$)=3$ ohm

Kt $($Torque constant$)=5$ Nm$/$A

Kv $($Voltage constant$)=5$ V$/($rad$/$s$)$

Nominal speed $=500$ rpm $($rev$/$minute$)$

Field winding losses will be neglected

please find no$-$load speed of DC motor