Question: A particle moves with position function s = t 4 - 4t 3 - 20t 2 + 20t t > 0 (a) At what time

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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