A particle moves with position function s = t 4 - 4t 3 - 20t 2 +

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A particle moves with position function
s = t4 - 4t3 - 20t2 + 20t    t > 0
(a) At what time does the particle have a velocity of 20 mys?
(b) At what time is the acceleration 0? What is the significance of this value of t?

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