10. A new electric car is being tested on a straight, at, track. The graph below illustrates the results of the test. The speed v of the car in meters per second is plotted against the time tin seconds. The graph has been divided into three time periods: I (from t = 0 to 6 3), II (from t = 6 to 10 s), and TH (from t = 10 to 12 s). What is the total distance traveled from t = 6 to 12 s? 30 20 v (mls) E 10 t (s) 11. A train has a constant acceleration of a = 3 m/s2 and starts 2 sec before another train that is 100 meters away from it. The other train moves in the same direction at 6 m/s. How long before the trains collide? 12. The velocity of a particle moving along the x axis is given by vx = a t b t3 where a = 33 m/s2, b = 2.1 m/s4 What is its acceleration at t = 3 s? 13. Suppose the position equation for a moving object is given by s(t)=3t3+2t+5 where s is measured in meters and t is measured in seconds. Find the velocity of the object when t = 3. Find the maximum positive displacement of the object. (for positive t)