College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 27

In demonstrating a dance step, a person moves in one dimension, as shown in Fig. What are (a) the average speed and (b) the average velocity for each phase of the motion (c) What are the instantaneous velocities at t = 1.0 s, 2.5 s, 4.5 s, and 6.0 s (d) What is the average velocity for the interval between t = 4.5 s and t = 9.0 s [ Hint : Recall that the overall displacement is the displacement between the starting point and the ending point.]

FIGURE Position versus time See Exercise.