# Displacement vs Time Graph for Activity 20B

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

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

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