At t$=0$t$=0$ the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by $($t$)=($$($t$)=(260$ rad$/$srad$/$s $)$t$()$t$(20\mathrm{.}8$ rad$/$s$2$rad$/$s$2)$t$2()$t$2(1\mathrm{.}59$ rad$/$s$3$rad$/$s$3)$t$3)$t$3.$

How fast was the motor shaft rotating at t$=0$t$=0,$ when the current was reversed?

Express your answer in radians per second.