Question

a man is driving a car at a speed of 72kmph towards a hill. he sounds the horn and hears it's echo after 2 seconds. the distance between the hill and the place where the horn was sounded is​

Answer 1

Answer:

Let the distance from the hill the horn was sounded is d

v=72kmph

v=72∗185=20m/s

Let the car traveled x distance in 2 sec:

x=v∗t=20∗2=40m

Total distance traveled by sound=d+(d−x)

vs∗t=2d−40340∗2=2d−402d=680+40d=2720d=260m