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If x = 4t + t^2 (SI units), what is the velocity at t = 3 s?
A12 m/s
B10 m/s
C13 m/s
D7 m/s
Answer & Solution
Correct answer: B. 10 m/s
v = dx/dt = 4 + 2t = 4 + 6 = 10 m/s.
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