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NEET 2017 Physics question

PhysicsMotion in a PlaneNEET 2017

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time . On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time . The time taken by her to walk up on the moving escalator will be

Answer: (3)

Solution

Let the length of the escalator be . Her speed relative to the escalator is and the speed of the escalator relative to the ground is . When she walks up the moving escalator the two speeds add: $ =

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Question ID VK-092054