Question

The sound propagates in the air with a speed of 340 m/s. How long to hear the blast of a cannon 20 km away?

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Answer 1

Hello..!

To calculate the time we apply the following data to the problem.

Data:

• D = 20km
• V = 340m/s
• T = ?

Now, we convert kilometers to meters.

Conversion:

• D = 20km • (1000m/1km)
• D = 20000m

Then, we apply the formula that is.

Formula:

• T = D/V

Finally we develop the problem.

Developing:

• T = 20000m / 340m/s
• T = 58s

The time to hear the boom is 58 seconds.