A student dropped an object from a building 100m high. If the height of the object above the ground after \(t\) seconds is \(100+\) \(4.9 t^{2} \mathrm{~m}\). how fast is it falling 3 seconds after it is dropped?

A. \(14.7 \mathrm{~m} / \mathrm{sec}\)
B. \(85.3 \mathrm{~m} / \mathrm{sec}\)
C. \(29.4 \mathrm{~m} / \mathrm{sec}\)  
D. \(70.6 \mathrm{~m} / \mathrm{sec}\)

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Correct Answer: C