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A body has x = 8.5 + 2.5t^2 (SI). What is its velocity at t = 2.0 s?
A20 m/s
B5 m/s
C18.5 m/s
D10 m/s
Answer & Solution
Correct answer: D. 10 m/s
v = dx/dt = 5t, giving 10 m/s at t = 2.0 s.
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