Question

14. A car driving at a constant speed of
25 m s-, heads straight to a mountain. The
driver presses the car horn and receives.
an echo 3.6 seconds later. Calculate the
distance between the car and the mountain
when the driver pressed the horn. (Take
the speed of sound in air to be 300 m s-?)​

Answer 1

Answer:

Explanation:

If the speed of engine is v, the distance travelled by engine in 5s will be 5v and hence the distance travelled by sound in reaching the hill and coming back to the moving driver

=900+(900−5v)

1800−5v

So, the time interval between original sound and it's echo

t=  

330

(1800−5v)

​  

=5⇒v=30m/s

Answer 2

Answer:

Answer is 300m/s

Explanation:

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