Question

A ball falls from 80m above the ground. A person on the roof on which the ball falls hears the sound of the ball hitting the ground 5s after its fall. Find the speed of the sound in air?​

Answer 1

Answer:

The time at which stone hits the ground can be found by s=ut+

2

1

gt

2

∴300=0×t+

2

1

×9.8×t

2

∴t=7.82s

Now, the time for sound to travel 300m is t=

340

300

=0.88s

Therefore, total time will be addition of the two times.

t=7.82+0.88=8.7s

Explanation:

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Answer 2

Explanation:

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