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A particle moves with s = t³ - 3t². At what positive time is it momentarily at rest?
At = 6
Bt = 1
Ct = 3
Dt = 2
Answer & Solution
Correct answer: D. t = 2
Velocity 3t² - 6t = 3t(t - 2) is zero at t = 2 for positive t.
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