The accompanying figure shows the velocity v(t) of a particl

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The accompanying figure shows the velocity v(t) of a particle moving on a horizontal coordinate line,for in the closed interval [0,10] .
Answer the questions below using points,lists of points,intervals,or unions of intervals,whichever is appropriate.
Note:Derivatives at the endpoint should be right-hand derivatives,while derivatives at the endpoint t=0 should be left-hand derivatives t=10.

When does the particle speed up?
ANSWER:
When does the particle slow down?
ANSWER:
When is the particle's acceleration positive?
ANSWER:

加速阶段是在0-1,4-5,8-9.减速阶段是在1-2,7-8,9-10.加速度为正是在0-1,7-8,9-10

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