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* ***Dear Experts and Friends, Can you please help me solve the given numerical:**

__Q.__ A construction worker's helmet slips and falls when he is 78.4 metres above the ground. He hears the sound of helmet hitting the ground after 4.23 seconds. Find the speed of sound in air if g = 9.8 m/s^{2}.

Thank You !

**Dear Experts and Friends, Can you please help me solve the given numerical:**

Thank You !

__Q.__A construction worker's helmet slips and falls when he is 78.4 metres above the ground. He hears the sound of helmet hitting the ground after 4.23 seconds. Find the speed of sound in air if g = 9.8 m/s^{2}.Thank You !

$Timetoreachthehelmettotheground=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2\times 78.4}{9.8}}\phantom{\rule{0ex}{0ex}}=4s\phantom{\rule{0ex}{0ex}}sosoundtakes(4.23-4)s=.23storeachconstructionworker\text{'}s\phantom{\rule{0ex}{0ex}}hencespeedofsound=\frac{78.4}{.23}=340.86m/s$

Regards

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