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A stone falls so that its distance is s = 4.9t^2 metres. What is its exact speed at t = 2 s?
A9.8 m/s
B19.6 m/s
C4.9 m/s
D39.2 m/s
Answer & Solution
Correct answer: B. 19.6 m/s
Speed is the derivative 9.8t, which equals 19.6 m/s at t = 2.
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