Question

A man fires a gun and hears an echo after 5 s. then he runs with a velocity away from the wall and fires. he hears the echo after 10 s . find his velocity. velocity of sound in air is 340m/s.
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Answer 1

Answer:

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Explanation:

The speed of the sound is calculated as follows.

Let d be the distance between the man and the hill in the beginning.

v=t2×d = 52×d→eqn1

He moves 310 m towards the hill. Therefore the distance will be (d - 310) m. Therefore,

v=32(d−310)→eqn2

Since velocity of sound is same, equating (1) and (2), we get

52d=32(d−310)

3d = 5d - 1550

2d = 1550

d = 775 m

Hence, the velocity of sound v=52×775 (substituting in equation 1)

v=310m/s

Answer 2

Explanation:

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