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LoginA train is approaching a platform with a speed of 20 km/hr. A bird is sitting on a pole at the platform.When train is 2 km away from the pole brakes areapplied so that the train decelerates uniformly,-simultaneously the bird also flies towards the train witha velocity 60 km/hr. It touches the nearest point on thetrain and flies back and back again and so on. Thetotal distance travelled by the bird before train stop is(A) 30 km(B) 15 km(C) 12km(D) 10 km
Physics Secondary School in Physics 1 year ago
Step 1 : Fnding the acceleration of the train when it is at the distance of 2 km from the pole.v2=u2+2asfinal VELOCITY 'v' is 0 because it is ASSUMED that the train is supposed to stop when it reaches the pole. initial velocity = 20 km/hr ...(given) s = 2 km, the distance of the train from the pole.v2=u2+2as0=400+4aa=-100km/hr2Step 2: Finding the time in which the train travelled 2kms to the pole.v=u+ato=20+(-100)tt=1/5hrStep 3: Finding the distance that the bird covers in the above period of time. distance = speed (of bird) x time (above calculated) =60*1/5 12kmmark me as a brain;iest if it helps you
Posted on 12 Sep 2024, this text provides information on Physics related to Secondary School in Physics. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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