differentiation

Question: The equation of motion of a stone, thrown vertically upwards is $s=ut-6.3{{t}^{2}},$ where the units of s and t are cm and sec. If the stone reaches at maximum height in 3 sec, then u =



1) $18.9\,\,cm/\sec $
2) $12.6\,\,cm/\sec $
3) $37.8\,\,cm/\sec $
4) None of these
Solution: Explanation: No Explanation
Application of Derivatives

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