A construction worker working at a height of \[78.4\,\,m\] above the ground bends and his helmet slips falls down. He hears the sound of the helmet hitting the ground \[0.23\] seconds after it slipped. Find the speed of sound in air.

A construction worker working at a height of \[78.4\,\,m\] above the g

1.	A construction worker working at a height of \[78.4\,\,m\] above the ground bends and his helmet slips falls down. He hears the sound of the helmet hitting the ground \[0.23\] seconds after it slipped. Find the speed of sound in air.
A.	\[512\,\,m\,\,{{s}^{-1}}\]
B.	\[215\,\,m\,\,{{s}^{-1}}\]
C.	\[341\,\,m\,\,{{s}^{-1}}\]
D.	\[651\,\,m\,\,{{s}^{-1}}\]
Answer» D. \[651\,\,m\,\,{{s}^{-1}}\]

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A construction worker working at a height of \[78.4\,\,m\] above the ground bends and his helmet slips falls down. He hears the sound of the helmet hitting the ground \[0.23\] seconds after it slipped. Find the speed of sound in air.

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