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For x = 8.5 + 2.5t^2 (SI), what is the average velocity between t = 2 s and t = 4 s?
A10 m/s
B30 m/s
C20 m/s
D15 m/s
Answer & Solution
Correct answer: D. 15 m/s
x(4) = 48.5 m and x(2) = 18.5 m, so the average velocity is 30/2 = 15 m/s.
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