Refer to Add Math 360 Text Page 500 Activity 20B[br]for instructions.

1. At what time t does the particle change direction (turn back)?[br]2. During which period of time is the velocity (ds/dt) positive, and in which period of time is the velocity negative?[br]3. When is the particle instantaneously at rest? (State the value of t when this occurs)[br]4. Is the velocity of the particle at time t = 0 , also zero? If not, what is the velocity?[br]5. When does the particle return to the fixed point O?