Question

A car approaches a hill with a constant speed. When it is at a distance of 0.96 km, it blows horn whose Eco is heard by the driver 3 second later. If the speed of the sound in air is 300 m/s. Then calculate the speed of the car.​ Everyone like my economy answers please​

Answer 1

Answer:

$\huge\frak\red{♡︎SᴏLᴜTɪᴏɴ}$

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

$\sf =900+(900−5v)$

$\sf 1800−5v$

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

$\sf t=\dfrac{(1800-5V)}{330}=5$

$\sf\implies{V=30M/s}$

$\huge\fbox\orange{❥︎MʀJᴀʏMᴀʜᴀʀᴀsᴛʀᴀ}$

Answer 2

solution :-

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

=900 +(900-5v)

1800- 5v

so the time intreval between original sound and it's echo.

t= (1800-5v ) by 330 =5

=v=30m/s.

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