Person in a car moving towards a mountain with uniform velocity of 10 m/s, sounds a horn and hears the echo after 2.5 second. then, the distance of the car from the mountain, when it sounds horn is ____ m. (consider velocity of sound in air as 330 m/s.)
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d=v×t=(330+10)×(2.5/2)=170×2.5=425m
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