Question

an echo is heard after 0. 8 seconds, when a boy fire a cracker, 132 metre away from tall building then calculate the speed of sound

Answer 1

The speed of sound is 165 m/s.

Explanation:

It is given that,

The echo is heard after 0.8 seconds, when a boy fire a cracker, 132 meter away from tall building.

To find,

Speed of sound.

Solution,

Speed of sound is given by total distance covered divided by total time taken. It is given by :

$v=\dfrac{d}{t}$

$v=\dfrac{132\ m}{0.8\ s}$

v = 165 m/s

So, the speed of sound is 165 m/s. Hence, this is the required solution.

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Answer 2

Answer:

here t= 0.8s

s=2×132.8m

=26.56m

speed=s/t

=26.56/0.8

=2656/8

=332m/s

K. E =1/2 ×m×1

1/2×2×0.1×0.1

= 0.01j

I hope it helps you