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AP EAMCET202316 May 2023Morning ShiftPhysicsMotion in One DimensionActual

A person walks up a stalled escalator in 80 sec . When standing on the same escalator, now moving, he is carried up in 20 s. The time taken by him to walk up the moving escalator is

Options

  1. A4 ~s
  2. B8 ~s
  3. C12 ~s
  4. D16 ~s

Correct answer

D. 16 ~s

Step-by-step solution

Let distance travelled = D Speed of a person walks up v₁= D 80 Speed of escalator v₂= D 20 Total speed v = v ₁+ v ₂ 20 aligned & = D 80 + D 20 & = D+4 D 80 = 5 D 80 aligned The time taken by him t ₀ walk up the moving escalator is aligned & t= D 5 D / 80 & =16 ~s aligned

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