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A particle moves with s = t³ − 6t² + 9t. At what time t > 0 does it first come to rest?
A2
B1
C0
D3
Answer & Solution
Correct answer: B. 1
Velocity 3t² − 12t + 9 = 3(t − 1)(t − 3) first vanishes at t = 1.
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