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A person walks up a stalled 15 m long es...

A person walks up a stalled 15 m long escalator in 90 s. When standing on the same escalator, now moving, the person is carried up in 60 s. How much time would it take that person to walk up the moving escalator? Does the answer depend on the length of the escalator?

A

27 s

B

50 s

C

18 s

D

36 s

Text Solution

Verified by Experts

The correct Answer is:
D
`upsilon_(1)=(s)/(90), upsilon_(2)=(s)/(60)`
Now, `t=(s)/(upsilon_(1)+upsilon_(2))=(s)/((s)/(90)+(s)/(60))=(90xx60)/(90+60)=36s`
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DC PANDEY ENGLISH-MOTION IN A PLANE-(A) Taking it together
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  2. The velocity upsilon of a particle as a function of its position (x) i...

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  3. A person walks up a stalled 15 m long escalator in 90 s. When standing...

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  4. A car starts moving along a line, first with acceleration a=5 ms^(-2) ...

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  5. The displacement of a particle moving in a straight line depends on t...

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  6. A starts from rest, with uniform acceleration a. The acceleration of t...

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  7. A ball is dropped on the floor from a height of 10m. It rebounds to a ...

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  8. Particle A is moving along X-axis. At time t = 0, it has velocity of 1...

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  9. At a metro station, a girl walks up a stationary escalator in time t1....

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  10. The displacement of a body along X-axis depends on time as sqrt(x)=t+1...

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  11. A cyclist starts from the centre O of a circular park of radius 1 km. ...

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  12. A particle moves along a straight line OX. At a time t(in second), the...

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  13. Two boys are standing at the ends A and B of a ground where AB = a. Th...

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  14. A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms^...

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  19. A point initially at rest moves along x-axis. Its acceleration varies ...

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