Question

There is road between two parallel rows of building and distance between the rows of building is 106 m. Find the velocity of car if a car blows a horm shose echo is heard by the drive agfter 1 s.
(Given, speed of sound = 340 m/s)
A. 180 m/s
B. 165 m/s
C. 323 m/s
D. 150 m/s

Answer 1

Correct Answer - C
Signal goes from A to B. Let the velocity of car=v.
Distance travelled AB=v,oA=`v/2`
`(2xx)/1=340 rArr xx=170 m`
`(170)^(2)=(53)^(2)+(v^(2))/4`
`sqrt(4(28900-2809))=v" "rArrv=323m//s`