From the top of a building of height\[40\,\,m\], a boy throws a stone vertically upwards with an initial velocity of \[10\,\,m\,\,{{s}^{-1}}\] such that it eventually falls to the ground. At what time will the stone reach the ground?\[(g=10\,\,m{{s}^{-2}})\]

From the top of a building of height\[40\,\,m\], a boy throws a stone

1.	From the top of a building of height\[40\,\,m\], a boy throws a stone vertically upwards with an initial velocity of \[10\,\,m\,\,{{s}^{-1}}\] such that it eventually falls to the ground. At what time will the stone reach the ground?\[(g=10\,\,m{{s}^{-2}})\]
A.	\[4s\]
B.	\[3s\]
C.	\[2s\]
D.	\[1s\]
Answer» B. \[3s\]

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From the top of a building of height\[40\,\,m\], a boy throws a stone vertically upwards with an initial velocity of \[10\,\,m\,\,{{s}^{-1}}\] such that it eventually falls to the ground. At what time will the stone reach the ground?\[(g=10\,\,m{{s}^{-2}})\]

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