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Question
The speed limit for a vehicle on road is 120 km/ hr. A policeman detects a drop of 10% in the pitch of horn of a car as it passes him. Is the policeman justified in punishing the car driver for crossing the speed limit? (Given: Velocity of sound= 340 m/s)
Solution
Given: Speed limit, vL = 120 km/hr
= 17.89 m/s
vS = 64.40 km/hr
VS < VL
Hence, the policeman is not justified in punishing the car driver.
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