11. Geometric sum of displacement magnitudes is a total displacement of a magnitude generally lesser, equal, or greater than distance?

Answer: (briefly express your opinion)

12. Velocity, or the rate of position change with time, is actually displacement per unit time. As a vector, instantaneous velocity has its direction and magnitude called linear speed measured in ..... or angular speed measured in ...... Does this rule apply to average velocity, which is total displacement per unit of travelling time, and average speed defined as an average distance travelled in a unit time. Consider, for instance, a point moving 4 meters north during 3 seconds, 3 meters east during next 4 seconds and getting straight back to initial location during 5 seconds. Figure out velocities of each leg, total distance and displacement travelled, velocity and speed on each leg, as well as average velocity and speed.

Answer: (briefly state your conclusions)

13. Instantaneous linear acceleration a is a vector constructed by two orthogonal components - tangential linear acceleration a responsible for velocity magnitude and normal linear acceleration a_n changing velocity direction only. Motion(s) under constant linear acceleration is (are)

Answer: (name and briefly describe)

14. In case of a circular motion, constant tangential acceleration means constant ............. acceleration measured in ........