Example A Helicopter Blade

A helicopter blade has an angular speed of $6\mathrm{.}50re\frac{v}{s}$ and an angular acceleration of $1\mathrm{.}30re\frac{v}{s^2}.$ For point $1$ on the blade, find the magnitude of $($a$)$ the tangential speed and $($b$)$ the tangential acceleration.

Data: Angular speed $=6\mathrm{.}50re\frac{v}{s},$ Angular acceleration $=1\mathrm{.}30re\frac{v}{s^2}.$ Radial distance $r=3\mathrm{.}00$ m