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.​
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Answer 1

Answer:

100 m/s20 m/s 50 m/s70 m/s

Answer : B

Solution : Here, t = 6 s and speed of sound `v_s = 300 m//s` <br> Now, distance travelled by the car = `v xx 6 = x` <br> Distance travelled by sound, ` s = 960 + (960 - x) = (1920 - x)m` <br> Since, `v_s = s/t` <br> or `330 = ((1920 -x))/6 or 1800 = 1920 -x` <br> x = 120 m <br> Speed of car, `v = x/6 = 120/6 = 20 m//s`

Explanation:

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