11. A mass covers a displacement of 810 m [W] in 9.00 s with a constant acceleration. If its initial velocity was equal to zero, what was its acceleration? 12. A man ran half way around a circular track of radius 1.0 km in 2.0 minutes starting at the most southerly point. During this time determine his: a) average speed in m/s b) average velocity in m/s 13. If you run 1.00 x 102 m at a speed of 5.0 m/s and then walk 3.00 x 102 m at a speed of 1.0 m/s what is your average speed? 14. A person runs 1.00 x 102 m [N], 1.50 x 102 m [S] and finally 5.0 x 101 m [E]. If the average speed for the run is 40 m/s, what is the average velocity for the run? 15. A coin rolls off a table with an initial horizontal speed of 25 cm/s. How far will the coin land from the bas the table if the table's height is 1.25 m? 16. A baseball is thrown with an initial velocity of 27.0 m/s [350 above the horizontal]. a) What are the components of the ball's initial velocity? b) How high and far will it travel