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s = t^4 − 4t^3 − 36t^2 + 25t
a)At what time does the particle have a velocity of 25 m/s? (Enter your answers as a comma-separated list.)

(b)
At what time is the acceleration 0? (Round your answer to two decimal places.)

s t4 4t3 36t2 25t aAt what time does the particle have a velocity of 25 ms Enter your answers as a commaseparated list b At what time is the acceleration 0 Roun class=