12.1 What type of velocity, linked to rotational motion, is always equal for all points of a spinning rigid body? 12.2 The propeller of an airplane, see the sketch below, moves from rest with an acceleration of 3.3 x 10-² rad.s-² for 525 s. The propeller then decelerates to rest at 3.2 rad.s2. If the entire motion of the propeller takes 1.5 x 10³ s, what is the average angular speed of the entire motion of the propeller? (4)

12.1 What type of velocity, linked to rotational motion, is always equal for all points of a spinning rigid body? 12.2 The propeller of an airplane, see the sketch below, moves from rest with an acceleration of 3.3 x 10-² rad.s-² for 525 s. The propeller then decelerates to rest at 3.2 rad.s2. If the entire motion of the propeller takes 1.5 x 10³ s, what is the average angular speed of the entire motion of the propeller? (4)