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 =

The equation of motion of a stone, thrown vertically upwards is \[s=ut

1.	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 =
A.	\[18.9\,\,cm/\sec \]
B.	\[12.6\,\,cm/\sec \]
C.	\[37.8\,\,cm/\sec \]
D.	None of these
Answer» D. None of these

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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 =

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