alleryStart learning →A particle moves so that s = t^3 - 6t^2 + 9t. What is its velocity at t = 2?
A3
B-3
C0
D9
Answer & Solution
Correct answer: B. -3
v = ds/dt = 3t^2 - 12t + 9, which is 12 - 24 + 9 = -3 at t = 2.
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