CASE - STUDY - BASED QUESTIONS: A) Two parallel rail tracks run north - south. Train A of 120 m long moves north with speed 72 kmph and train B of 130 m long moves south with a speed 36 kmph. A bird is flying parallel to train B in the opposite direction with a speed 18 kmph and monkey running on the roof of the train A against it's motion with a speed 18 kmph with respect to train A.
28. Velocity of train B w.r.t train A
(1) 20 m/s (2) 10 m/s (3) 30m/s (4) 40m's 29. Velocity of ground w.r.t train B
(1) 20 m/s (2) 10 m/s (3) 30 m/s (4) Om/s 30. Velocity of monkey as observed by a man standing on the ground
(1) 30 m/s (2) 20 m/s (3) 5m/s (4) 25m/s
31. Time after which train B crosses the bird.
(1) 6.5 sec (2) 6.8 sec (3) 8.6 sec (4) 12.5 sec shown in
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Id623 323 1989
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Before solving the question, we must draw a diagram for better understanding. Then we will use the expression of relative velocity which is given as the difference between two velocities. We must remember to follow sign convention and we can take any of the directions as positive and the other as negative.in the case of monkeys we will add and subtract velocity of train A
to make it relative velocity of monkey with suspect to train A
.
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