CBSE Class 11-science Answered
If a police car running after a thief's car with the speed 126 km/hr if a bullet is fired from the police car with the speed of 200m/s .If the speed of police car is 36 km/hr.if the initial distance between police car and thieves car is 200 m .Find out whether bullet will hit the thief car
Asked by aryanvishwakarmaaryan | 19 Jul, 2018, 01:28: PM
Expert Answer
speed of thief's car = 126 km/hr = 35 m/s ; speed of police car =36 km/hr = 10 m/s
speed of firing of bullet = 200 m/s ; travelling speed of bullet = 200+10 = 210 m/s
let t seconds after firing, the bullet hits the thief's car.
Since initial gap of distance between police and thief is 200 m, we write,
35×t + 200 = 210×t ;
since the above equation has solution t = (8/7) s, we can say that the bullet hits the thief's car (8/7) second after firing
Answered by Thiyagarajan K | 20 Jul, 2018, 11:47: AM
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