Consider a particle with position vector r = Rf, where the radius R is not constant, and the angular speed is not constant. dt a) Show that the velocity vector, v=Rf + ROO Hint: The velocity vector is always the derivative of the position vector de Hint 2: R=1 and It's just a different notation for time derivatives dR dt' dt b) Show that the acceleration vector, a = (R R) + (R + 2) -