A man shot a bullet with a speed of \[10\,\,m{{s}^{-1}}\] which just penetrates a plank of wood. With what speed should he shoot the bullet so that it passes through \[10\] similar planks?

A man shot a bullet with a speed of \[10\,\,m{{s}^{-1}}\] which just p

1.	A man shot a bullet with a speed of \[10\,\,m{{s}^{-1}}\] which just penetrates a plank of wood. With what speed should he shoot the bullet so that it passes through \[10\] similar planks?
A.	\[100\,\,m\,\,{{s}^{-1}}\]
B.	\[104\,\,m\,\,{{s}^{-1}}\]
C.	\[10\sqrt{10}m\,\,{{s}^{-1}}\]
D.	\[5\sqrt{10}m\,\,{{s}^{-1}}\]
Answer» D. \[5\sqrt{10}m\,\,{{s}^{-1}}\]

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A man shot a bullet with a speed of \[10\,\,m{{s}^{-1}}\] which just penetrates a plank of wood. With what speed should he shoot the bullet so that it passes through \[10\] similar planks?

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